1880,286.8
1881,286.89
1882,286.91
1883,286.81
1884,286.73
1885,286.7
1886,286.71
1887,286.68
1888,286.8
1889,286.89
1890,286.64
1891,286.76
1892,286.74
1893,286.71
1894,286.7
1895,286.79
1896,286.86
1897,286.9
1898,286.73
1899,286.85
1900,286.92
1901,286.86
1902,286.74
1903,286.65
1904,286.56
1905,286.73
1906,286.79
1907,286.61
1908,286.58
1909,286.53
1910,286.58
1911,286.56
1912,286.66
1913,286.67
1914,286.85
1915,286.89
1916,286.66
1917,286.6
1918,286.75
1919,286.78
1920,286.74
1921,286.79
1922,286.73
1923,286.76
1924,286.72
1925,286.8
1926,286.91
1927,286.8
1928,286.79
1929,286.64
1930,286.86
1931,286.91
1932,286.84
1933,286.72
1934,286.86
1935,286.81
1936,286.85
1937,286.98
1938,286.98
1939,286.98
1940,287.08
1941,287.13
1942,287.1
1943,287.14
1944,287.26
1945,287.12
1946,286.97
1947,286.96
1948,286.91
1949,286.92
1950,286.83
1951,286.94
1952,287.01
1953,287.08
1954,286.88
1955,286.86
1956,286.8
1957,287.04
1958,287.06
1959,287.04
1960,286.97
1961,287.05
1962,287.02
1963,287.06
1964,286.8
1965,286.9
1966,286.95
1967,286.98
1968,286.93
1969,287.07
1970,287.03
1971,286.91
1972,287.01
1973,287.15
1974,286.92
1975,286.98
1976,286.88
1977,287.18
1978,287.07
1979,287.16
1980,287.27
1981,287.32
1982,287.13
1983,287.3
1984,287.15
1985,287.11
1986,287.19
1987,287.33
1988,287.4
1989,287.28
1990,287.43
1991,287.42
1992,287.22
1993,287.24
1994,287.31
1995,287.45
1996,287.34
1997,287.47
1998,287.63
1999,287.41
2000,287.42
2001,287.54
2002,287.62
2003,287.61
2004,287.54
2005,287.68
2006,287.63
2007,287.65
2008,287.53
2009,287.64
2010,287.71
2011,287.59
2012,287.63
2013,287.65
2014,287.74
2015,287.86