| date | cumsumarea | cumsumsites |
|---|---|---|
| 1838 | 1108.0 | 2 |
| 1858 | 7967.0 | 3 |
| 1895 | 8210.0 | 5 |
| 1899 | 8584.0 | 6 |
| 1900 | 16824.0 | 7 |
| 1903 | 34514.0 | 8 |
| 1905 | 37349.0 | 10 |
| 1907 | 37608.0 | 11 |
| 1908 | 37821.0 | 12 |
| 1909 | 3699973.0 | 22 |
| 1910 | 3699987.0 | 23 |
| 1911 | 3699987.0 | 26 |
| 1912 | 3708225.0 | 28 |
| 1913 | 3714093.0 | 37 |
| 1914 | 3884420.0 | 44 |
| 1915 | 3884423.0 | 49 |
| 1916 | 3884481.0 | 54 |
| 1917 | 4050880.0 | 77 |
| 1918 | 4051821.0 | 94 |
| 1919 | 4052572.0 | 114 |
| 1920 | 4106302.0 | 146 |
| 1921 | 4274901.0 | 211 |
| 1922 | 5033622.0 | 236 |
| 1923 | 5557501.0 | 278 |
| 1924 | 6398817.0 | 308 |
| 1925 | 6409517.0 | 339 |
| 1926 | 6452225.0 | 371 |
| 1927 | 6457975.0 | 388 |
| 1928 | 6707056.0 | 425 |
| 1929 | 6726840.0 | 459 |
| 1930 | 6883913.0 | 513 |
| 1931 | 6913785.0 | 553 |
| 1932 | 7238870.0 | 613 |
| 1933 | 7354773.0 | 749 |
| 1934 | 7723861.0 | 802 |
| 1935 | 9508982.0 | 874 |
| 1936 | 9576330.0 | 947 |
| 1937 | 9865811.0 | 1118 |
| 1938 | 11455796.0 | 1347 |
| 1939 | 11752451.0 | 1568 |
| 1940 | 11948273.0 | 1701 |
| 1941 | 12143666.0 | 1814 |
| 1942 | 12815958.0 | 1891 |
| 1943 | 12954300.0 | 1937 |
| 1944 | 12968968.0 | 1987 |
| 1945 | 12977240.0 | 2077 |
| 1946 | 13009111.0 | 2205 |
| 1947 | 13111946.0 | 2339 |
| 1948 | 14422093.0 | 2524 |
| 1949 | 15721904.0 | 2669 |
| 1950 | 15950398.0 | 2830 |
| 1951 | 23100319.0 | 3021 |
| 1952 | 26096949.0 | 3240 |
| 1953 | 26615708.0 | 3493 |
| 1954 | 30990950.0 | 3793 |
| 1955 | 33067843.0 | 4143 |
| 1956 | 40042874.0 | 4445 |
| 1957 | 42713480.0 | 4756 |
| 1958 | 44600827.0 | 5088 |
| 1959 | 48473160.0 | 5386 |
| 1960 | 50237974.0 | 5696 |
| 1961 | 52973667.0 | 6244 |
| 1962 | 57552653.0 | 6613 |
| 1963 | 67001484.0 | 7015 |
| 1964 | 69508418.0 | 7390 |
| 1965 | 72232301.0 | 7857 |
| 1966 | 75857453.0 | 8193 |
| 1967 | 81475577.0 | 8631 |
| 1968 | 86952816.0 | 9225 |
| 1969 | 92295649.0 | 9725 |
| 1970 | 113979938.0 | 10215 |
| 1971 | 119898791.0 | 10781 |
| 1972 | 129537157.0 | 11382 |
| 1973 | 141495607.0 | 11984 |
| 1974 | 159249161.0 | 12711 |
| 1975 | 170463835.0 | 13142 |
| 1976 | 179871138.0 | 13805 |
| 1977 | 193613674.0 | 14618 |
| 1978 | 199762559.0 | 15261 |
| 1979 | 216339277.0 | 15949 |
| 1980 | 242302201.0 | 16809 |
| 1981 | 263298837.0 | 17767 |
| 1982 | 274767069.0 | 18837 |
| 1983 | 289847608.0 | 20070 |
| 1984 | 297114284.0 | 21887 |
| 1985 | 311608240.0 | 23459 |
| 1986 | 342043199.0 | 25216 |
| 1987 | 356960084.0 | 26805 |
| 1988 | 388629255.0 | 28544 |
| 1989 | 424373871.0 | 30056 |
| 1990 | 454479686.0 | 32071 |
| 1991 | 493276189.0 | 33994 |
| 1992 | 541430194.0 | 36604 |
| 1993 | 555059497.0 | 38120 |
| 1994 | 572322277.0 | 40695 |
| 1995 | 603999668.0 | 42464 |
| 1996 | 624488104.0 | 44805 |
| 1997 | 654091819.0 | 46445 |
| 1998 | 690605090.0 | 48326 |
| 1999 | 704059148.0 | 50460 |
| 2000 | 738190877.0 | 54328 |
| 2001 | 784861647.0 | 60281 |
| 2002 | 813271783.0 | 63843 |
| 2003 | 832848290.0 | 66822 |
| 2004 | 885855156.0 | 70541 |
| 2005 | 917521131.0 | 74203 |
| 2006 | 942819469.0 | 77346 |
| 2007 | 972458871.0 | 80671 |
| 2008 | 1001345407.0 | 83398 |
| 2009 | 1027514301.0 | 85677 |
| 2010 | 1047767591.0 | 90542 |
| 2011 | 1176392472.0 | 92475 |
| 2012 | 1198259427.0 | 94112 |
| 2013 | 1216342180.0 | 97025 |
| 2014 | 1358561839.0 | 99016 |
| 2015 | 1381591099.0 | 100036 |
| 2016 | 1392683404.0 | 100062 |