1895    52.90
1896    54.28
1897    54.21
1898    54.15
1899    53.55
1900    55.15
1901    54.45
1902    54.26
1903    53.17
1904    53.57
1905    53.52
1906    53.96
1907    53.79
1908    54.47
1909    54.49
1910    55.04
1911    54.60
1912    52.62
1913    54.04
1914    55.00
1915    53.98
1916    53.67
1917    52.75
1918    54.24
1919    54.37
1920    53.43
1921    56.22
1922    54.46
1923    53.84
1924    53.45
1925    55.10
1926    54.62
1927    55.08
1928    54.40
1929    53.18
1930    54.68
1931    56.03
1932    54.58
1933    55.35
1934    56.88
1935    54.61
1936    54.56
1937    54.10
1938    55.75
1939    55.50
1940    54.15
1941    55.09
1942    54.44
1943    54.71
1944    54.65
1945    54.66
1946    55.35
1947    54.52
1948    54.23
1949    54.63
1950    53.93
1951    53.75
1952    54.85
1953    55.98
1954    55.90
1955    54.35
1956    54.63
1957    54.27
1958    54.58
1959    54.40
1960    54.17
1961    54.59
1962    54.41
1963    55.29
1964    54.29
1965    53.92
1966    54.01
1967    54.37
1968    54.08
1969    53.94
1970    54.09
1971    54.13
1972    54.16
1973    54.81
1974    54.77
1975    53.88
1976    54.16
1977    55.11
1978    53.75
1979    53.05
1980    54.73
1981    55.69
1982    53.53
1983    55.11
1984    54.38
1985    54.12
1986    55.83
1987    55.81
1988    55.11
1989    54.71
1990    56.35
1991    55.50
1992    55.23
1993    53.55
1994    55.15
1995    55.18
1996    54.23
1997    54.63
1998    56.66
1999    56.18
2000    56.29