1900  296.10
 1901  296.10
 1902  296.50
 1903  296.80
 1904  297.20
 1905  297.60
 1906  298.10
 1907  298.50
 1908  298.90
 1909  299.30
 1910  299.70
 1911  300.10
 1912  300.40
 1913  300.80
 1914  301.10
 1915  301.40
 1916  301.70
 1917  302.10
 1918  302.40
 1919  302.70
 1920  303.00
 1921  303.40
 1922  303.80
 1923  304.10
 1924  304.50
 1925  305.00
 1926  305.40
 1927  305.80
 1928  306.30
 1929  306.80
 1930  307.20
 1931  307.70
 1932  308.20
 1933  308.60
 1934  309.00
 1935  309.40
 1936  309.80
 1937  310.00
 1938  310.20
 1939  310.30
 1940  310.40
 1941  310.40
 1942  310.30
 1943  310.20
 1944  310.10
 1945  310.10
 1946  310.10
 1947  310.20
 1948  310.30
 1949  310.50
 1950  310.70
 1951  311.10
 1952  311.50
 1953  311.90
 1954  312.40
 1955  313.00
 1956  313.60
 1957  314.20
 1958  314.90
 1959  315.79
 1960  316.61
 1961  317.33
 1962  318.08
 1963  318.70
 1964  319.36
 1965  320.02
 1966  321.09
 1967  321.99
 1968  322.93
 1969  324.21
 1970  325.24
 1971  326.06
 1972  327.18
 1973  328.84
 1974  329.73
 1975  330.73
 1976  331.83
 1977  333.25
 1978  334.60
 1979  336.85
 1980  338.69
 1981  339.93
 1982  341.13
 1983  342.78
 1984  344.42
 1985  345.90
 1986  347.15
 1987  348.93
 1988  351.48
 1989  352.91
 1990  354.19
 1991  355.59
 1992  356.37
 1993  357.04
 1994  358.88
 1995  360.88
 1996  362.64
 1997  363.76
 1998  366.63
 1999  368.31
 2000  369.48
 2001  372.59
 2002  374.37
 2003  378.04
 2004  380.88
 2005  383.88
 2006  385.64
 2007  385.76
 2008  386.13
 2009  387.37
 2010  389.85
 2011  391.62
 2012  393.82
 2013  396.48
 2014  398.61
 2015  400.00
 2016  401.00
 2017  402.00
 2018  404.00