| Year | Area (ha) | Area (square km) | Cum Area (ha) | Cumulative Area (square km) | Number of sites | Cumulative number sites |
|---|---|---|---|---|---|---|
| 1838 | 111.9004 | 1.119 | 111.9 | 1.119 | 2 | 2 |
| 1858 | 685.8713 | 6.859 | 797.772 | 7.978 | 1 | 3 |
| 1895 | 24.3 | 0.243 | 822.072 | 8.221 | 2 | 5 |
| 1899 | 299.832 | 2.998 | 1121.904 | 11.219 | 2 | 7 |
| 1900 | 824 | 8.24 | 1945.904 | 19.459 | 1 | 8 |
| 1901 | 1110.42967 | 11.104 | 3056.333 | 30.563 | 4 | 12 |
| 1903 | 1769 | 17.69 | 4825.333 | 48.253 | 1 | 13 |
| 1904 | 5090.8457 | 50.908 | 9916.179 | 99.162 | 1 | 14 |
| 1905 | 283.5 | 2.835 | 10199.679 | 101.997 | 2 | 16 |
| 1907 | 25.8982 | 0.259 | 10225.577 | 102.256 | 1 | 17 |
| 1908 | 21.29999 | 0.213 | 10246.877 | 102.469 | 1 | 18 |
| 1909 | 366215.2029 | 3662.152 | 376462.08 | 3764.621 | 10 | 28 |
| 1910 | 1.33 | 0.013 | 376463.41 | 3764.634 | 1 | 29 |
| 1911 | 0 | 0.0 | 376463.41 | 3764.634 | 3 | 32 |
| 1912 | 823.80026 | 8.238 | 377287.21 | 3772.872 | 2 | 34 |
| 1913 | 586.79211 | 5.868 | 377874.003 | 3778.74 | 9 | 43 |
| 1914 | 17032.75 | 170.328 | 394906.753 | 3949.068 | 7 | 50 |
| 1915 | 0.20999 | 0.002 | 394906.963 | 3949.07 | 5 | 55 |
| 1916 | 5.80148 | 0.058 | 394912.764 | 3949.128 | 5 | 60 |
| 1917 | 16639.83964 | 166.398 | 411552.604 | 4115.526 | 24 | 84 |
| 1918 | 94.03755 | 0.94 | 411646.641 | 4116.466 | 18 | 102 |
| 1919 | 81.85559 | 0.819 | 411728.497 | 4117.285 | 20 | 122 |
| 1920 | 26398.90375 | 263.989 | 438127.401 | 4381.274 | 23 | 145 |
| 1921 | 16818.41131 | 168.184 | 454945.812 | 4549.458 | 66 | 211 |
| 1922 | 75359.64718 | 753.596 | 530305.459 | 5303.055 | 24 | 235 |
| 1923 | 53681.21043 | 536.812 | 583986.669 | 5839.867 | 42 | 277 |
| 1924 | 84227.31004 | 842.273 | 668213.98 | 6682.14 | 34 | 311 |
| 1925 | 8612.76173 | 86.128 | 676826.741 | 6768.267 | 31 | 342 |
| 1926 | 4258.51544 | 42.585 | 681085.257 | 6810.853 | 31 | 373 |
| 1927 | 595.86276 | 5.959 | 681681.119 | 6816.811 | 19 | 392 |
| 1928 | 24884.81258 | 248.848 | 706565.932 | 7065.659 | 36 | 428 |
| 1929 | 2372.73653 | 23.727 | 708938.669 | 7089.387 | 35 | 463 |
| 1930 | 16207.81012 | 162.078 | 725146.479 | 7251.465 | 59 | 522 |
| 1931 | 3058.79454 | 30.588 | 728205.273 | 7282.053 | 44 | 566 |
| 1932 | 20677.76057 | 206.778 | 748883.034 | 7488.83 | 59 | 625 |
| 1933 | 11107.02012 | 111.07 | 759990.054 | 7599.901 | 137 | 762 |
| 1934 | 36897.69496 | 368.977 | 796887.749 | 7968.877 | 54 | 816 |
| 1935 | 201084.3382 | 2010.843 | 997972.087 | 9979.721 | 76 | 892 |
| 1936 | 6955.40313 | 69.554 | 1004927.49 | 10049.275 | 78 | 970 |
| 1937 | 50150.75938 | 501.508 | 1055078.25 | 10550.782 | 197 | 1167 |
| 1938 | 197499.5725 | 1974.996 | 1252577.822 | 12525.778 | 247 | 1414 |
| 1939 | 79102.57949 | 791.026 | 1331680.402 | 13316.804 | 225 | 1639 |
| 1940 | 25416.44096 | 254.164 | 1357096.843 | 13570.968 | 136 | 1775 |
| 1941 | 21444.92981 | 214.449 | 1378541.772 | 13785.418 | 115 | 1890 |
| 1942 | 66872.23855 | 668.722 | 1445414.011 | 14454.14 | 73 | 1963 |
| 1943 | 13702.25202 | 137.023 | 1459116.263 | 14591.163 | 47 | 2010 |
| 1944 | 1467.41975 | 14.674 | 1460583.683 | 14605.837 | 50 | 2060 |
| 1945 | 850.56974 | 8.506 | 1461434.252 | 14614.343 | 92 | 2152 |
| 1946 | 3949.03331 | 39.49 | 1465383.286 | 14653.833 | 131 | 2283 |
| 1947 | 90917.07955 | 909.171 | 1556300.365 | 15563.004 | 148 | 2431 |
| 1948 | 135068.5277 | 1350.685 | 1691368.893 | 16913.689 | 170 | 2601 |
| 1949 | 132203.0616 | 1322.031 | 1823571.955 | 18235.72 | 153 | 2754 |
| 1950 | 24103.88703 | 241.039 | 1847675.842 | 18476.758 | 165 | 2919 |
| 1951 | 714759.9666 | 7147.6 | 2562435.808 | 25624.358 | 195 | 3114 |
| 1952 | 281374.2028 | 2813.742 | 2843810.011 | 28438.1 | 222 | 3336 |
| 1953 | 72054.5166 | 720.545 | 2915864.528 | 29158.645 | 256 | 3592 |
| 1954 | 432134.5023 | 4321.345 | 3347999.03 | 33479.99 | 312 | 3904 |
| 1955 | 208458.5404 | 2084.585 | 3556457.57 | 35564.576 | 357 | 4261 |
| 1956 | 701241.4938 | 7012.415 | 4257699.064 | 42576.991 | 298 | 4559 |
| 1957 | 280287.0172 | 2802.87 | 4537986.081 | 45379.861 | 364 | 4923 |
| 1958 | 220747.8768 | 2207.479 | 4758733.958 | 47587.34 | 355 | 5278 |
| 1959 | 445499.4441 | 4454.994 | 5204233.402 | 52042.334 | 393 | 5671 |
| 1960 | 185271.395 | 1852.714 | 5389504.797 | 53895.048 | 314 | 5985 |
| 1961 | 317896.8809 | 3178.969 | 5707401.678 | 57074.017 | 571 | 6556 |
| 1962 | 547034.3146 | 5470.343 | 6254435.993 | 62544.36 | 385 | 6941 |
| 1963 | 905077.7142 | 9050.777 | 7159513.707 | 71595.137 | 350 | 7291 |
| 1964 | 252423.8037 | 2524.238 | 7411937.51 | 74119.375 | 413 | 7704 |
| 1965 | 346445.462 | 3464.455 | 7758382.972 | 77583.83 | 489 | 8193 |
| 1966 | 503700.1891 | 5037.002 | 8262083.161 | 82620.832 | 352 | 8545 |
| 1967 | 631798.8353 | 6317.988 | 8893881.997 | 88938.82 | 461 | 9006 |
| 1968 | 677576.4936 | 6775.765 | 9571458.49 | 95714.585 | 562 | 9568 |
| 1969 | 576881.4006 | 5768.814 | 10148339.891 | 101483.399 | 502 | 10070 |
| 1970 | 2149331.365 | 21493.314 | 12297671.255 | 122976.713 | 499 | 10569 |
| 1971 | 619833.6101 | 6198.336 | 12917504.865 | 129175.049 | 576 | 11145 |
| 1972 | 923488.3951 | 9234.884 | 13840993.261 | 138409.933 | 602 | 11747 |
| 1973 | 1173743.963 | 11737.44 | 15014737.223 | 150147.372 | 614 | 12361 |
| 1974 | 1853718.908 | 18537.189 | 16868456.131 | 168684.561 | 775 | 13136 |
| 1975 | 951043.5397 | 9510.435 | 17819499.671 | 178194.997 | 407 | 13543 |
| 1976 | 973626.4579 | 9736.265 | 18793126.128 | 187931.261 | 677 | 14220 |
| 1977 | 2406785.305 | 24067.853 | 21199911.433 | 211999.114 | 768 | 14988 |
| 1978 | 593392.0977 | 5933.921 | 21793303.531 | 217933.035 | 669 | 15657 |
| 1979 | 1693337.84 | 16933.378 | 23486641.371 | 234866.414 | 697 | 16354 |
| 1980 | 2605451.029 | 26054.51 | 26092092.4 | 260920.924 | 883 | 17237 |
| 1981 | 2100606.59 | 21006.066 | 28192698.99 | 281926.99 | 984 | 18221 |
| 1982 | 1138640.322 | 11386.403 | 29331339.312 | 293313.393 | 1068 | 19289 |
| 1983 | 1332390.38 | 13323.904 | 30663729.692 | 306637.297 | 1336 | 20625 |
| 1984 | 785116.5313 | 7851.165 | 31448846.223 | 314488.462 | 1788 | 22413 |
| 1985 | 1394502.136 | 13945.021 | 32843348.359 | 328433.484 | 1544 | 23957 |
| 1986 | 2828936.256 | 28289.363 | 35672284.615 | 356722.846 | 1780 | 25737 |
| 1987 | 1128957.583 | 11289.576 | 36801242.198 | 368012.422 | 1625 | 27362 |
| 1988 | 3340774.677 | 33407.747 | 40142016.875 | 401420.169 | 1788 | 29150 |
| 1989 | 3664296.594 | 36642.966 | 43806313.469 | 438063.135 | 1559 | 30709 |
| 1990 | 2911775.897 | 29117.759 | 46718089.366 | 467180.894 | 2217 | 32926 |
| 1991 | 3845496.54 | 38454.965 | 50563585.906 | 505635.859 | 2048 | 34974 |
| 1992 | 4528647.496 | 45286.475 | 55092233.402 | 550922.334 | 2729 | 37703 |
| 1993 | 1498418.975 | 14984.19 | 56590652.377 | 565906.524 | 1649 | 39352 |
| 1994 | 1431136.882 | 14311.369 | 58021789.259 | 580217.893 | 2548 | 41900 |
| 1995 | 3085375.151 | 30853.752 | 61107164.41 | 611071.644 | 1812 | 43712 |
| 1996 | 1785643.937 | 17856.439 | 62892808.347 | 628928.083 | 2346 | 46058 |
| 1997 | 2267855.578 | 22678.556 | 65160663.925 | 651606.639 | 1752 | 47810 |
| 1998 | 2580784.028 | 25807.84 | 67741447.952 | 677414.48 | 1877 | 49687 |
| 1999 | 1338115.516 | 13381.155 | 69079563.469 | 690795.635 | 2187 | 51874 |
| 2000 | 3255543.051 | 32555.431 | 72335106.52 | 723351.065 | 4000 | 55874 |
| 2001 | 4522170.794 | 45221.708 | 76857277.314 | 768572.773 | 5912 | 61786 |
| 2002 | 3069933.275 | 30699.333 | 79927210.589 | 799272.106 | 3639 | 65425 |
| 2003 | 2735882.241 | 27358.822 | 82663092.83 | 826630.928 | 3005 | 68430 |
| 2004 | 5066593.35 | 50665.934 | 87729686.18 | 877296.862 | 3750 | 72180 |
| 2005 | 3162185.08 | 31621.851 | 90891871.26 | 908918.713 | 3670 | 75850 |
| 2006 | 4665509.264 | 46655.093 | 95557380.524 | 955573.805 | 3324 | 79174 |
| 2007 | 5990199.925 | 59901.999 | 101547580.449 | 1015475.804 | 3279 | 82453 |
| 2008 | 2820575.142 | 28205.751 | 104368155.591 | 1043681.556 | 2592 | 85045 |
| 2009 | 2517069.908 | 25170.699 | 106885225.499 | 1068852.255 | 2073 | 87118 |
| 2010 | 9345464.88 | 93454.649 | 116230690.38 | 1162306.904 | 4807 | 91925 |
| 2011 | 12778248.44 | 127782.484 | 129008938.816 | 1290089.388 | 1853 | 93778 |
| 2012 | 694845.2821 | 6948.453 | 129703784.098 | 1297037.841 | 1149 | 94927 |
| 2013 | 18807.61999 | 188.076 | 129722591.718 | 1297225.917 | 26 | 94953 |