1850
288.6
1855
289.6
1860
290.7
1865
291.7
1870
292.7
1875
294.2
1880
296.6
1885
299.3
1890
300.9
1895
301.9
1900
303.4
1905
306
1910
309
1915
311.6
1920
314.4
1925
317.5
1930
320.9
1935
324.2
1940
326.1
1945
326.8
1950
328.6
1955
332.5
1960
338.5
1965
344
1970
351.9
1975
361.5
1978
366.7
1979
369.8
1980
373.2
1981
375
1982
377.4
1983
379.8
1984
382.3
1985
384.5
1986
386.8
1987
389
1988
392.5
1989
394.9
1990
396.5
464.3
414.3
514.3
1991
398.9
464.3
414.3
514.3
1992
399.9
464.3
414.3
514.3
1993
400.9
464.3
414.3
514.3
1994
403.1
464.3
414.3
514.3
1995
405.7
464.3
414.3
514.3
1996
408.1
464.3
414.3
514.3
1997
409.7
464.3
414.3
514.3
1998
413.1
464.3
414.3
514.3
1999
416
464.3
414.3
514.3
2000
417.6
464.3
414.3
514.3
2001
419.7
464.3
414.3
514.3
2002
422.1
464.3
414.3
514.3
2003
425.5
464.3
414.3
514.3
2004
427.4
464.3
414.3
514.3
2005
430.3
464.3
414.3
514.3
2006
433.1
464.3
414.3
514.3
2007
435.5
464.3
414.3
514.3
2008
438.5
464.3
414.3
514.3
2009
440.5
464.3
414.3
514.3
2010
443.5
464.3
414.3
514.3
2011
446.2
464.3
414.3
514.3
2012
449.2
464.3
414.3
514.3