Year,Value,NumPoints 1851,-0.0297622,1056 1852,-0.0076153,1206 1853,-0.245733,1385 1854,-0.206252,1327 1855,-0.274824,1366 1856,-0.386237,1386 1857,-0.375281,1441 1858,-0.282391,1507 1859,-0.39344,1389 1860,-0.119106,1074 1861,-0.267639,1009 1862,-0.362581,1173 1863,-0.34152,945 1864,-0.43597,980 1865,-0.15344,946 1866,-0.37525,940 1867,-0.146422,982 1868,-0.338542,1249 1869,-0.174261,1413 1870,-0.199885,1235 1871,-0.360486,1297 1872,-0.173851,1427 1873,-0.406226,1327 1874,-0.165436,1455 1875,-0.236505,1460 1876,-0.383234,1318 1877,0.109436,1581 1878,0.0375373,1589 1879,-0.23579,1596 1880,-0.298251,1644 1881,-0.297725,1703 1882,-0.153449,1729 1883,-0.305826,1865 1884,-0.516078,1828 1885,-0.356909,1904 1886,-0.390367,1871 1887,-0.383431,1878 1888,-0.323366,1803 1889,-0.337866,1804 1890,-0.480036,1767 1891,-0.249156,1705 1892,-0.379437,1743 1893,-0.363728,1819 1894,-0.427633,1749 1895,-0.389799,1762 1896,-0.143964,1733 1897,-0.177224,1900 1898,-0.361077,1882 1899,-0.144117,1982 1900,-0.187537,1915 1901,-0.348024,2046 1902,-0.372807,1970 1903,-0.557533,2053 1904,-0.598706,2018 1905,-0.339264,1984 1906,-0.339768,2003 1907,-0.396634,2053 1908,-0.373966,2004 1909,-0.40579,2057 1910,-0.417327,2015 1911,-0.471977,1865 1912,-0.654017,2043 1913,-0.415369,2097 1914,-0.297348,1913 1915,-0.121377,2036 1916,-0.333238,1984 1917,-0.295417,1886 1918,-0.250197,1820 1919,-0.265445,1825 1920,-0.20837,1933 1921,-0.200027,2060 1922,-0.327196,2133 1923,-0.326673,2132 1924,-0.312061,2062 1925,-0.224231,2045 1926,-0.103844,2117 1927,-0.102428,2130 1928,-0.191754,2069 1929,-0.262462,2069 1930,-0.0739721,2053 1931,-0.0267983,2105 1932,0.0156849,2113 1933,-0.318971,2046 1934,-0.12845,2071 1935,-0.176734,2102 1936,-0.0955579,2149 1937,0.164366,2085 1938,0.0418619,2078 1939,0.0143772,1931 1940,0.142873,1932 1941,-0.114383,1956 1942,0.00469478,1897 1943,0.0105917,1928 1944,0.192996,1857 1945,0.118914,1737 1946,-0.0906003,1959 1947,-0.136106,1961 1948,-0.114258,2007 1949,-0.123525,2062 1950,-0.234345,2087 1951,0.152122,2138 1952,0.107705,2056 1953,0.0944824,2052 1954,-0.0929433,2082 1955,-0.135216,2140 1956,-0.280458,2259 1957,0.0430424,2430 1958,-0.107745,2425 1959,-0.130173,2452 1960,0.00697989,2449 1961,-0.0361272,2446 1962,-0.0752839,2474 1963,0.120871,2458 1964,-0.402755,2517 1965,-0.245103,2496 1966,-0.0810746,2475 1967,-0.121458,2442 1968,-0.220334,2458 1969,-0.0134601,2512 1970,-0.0339731,2467 1971,-0.127815,2494 1972,-0.0572991,2503 1973,-0.0383137,2467 1974,-0.0951732,2462 1975,-0.139494,2504 1976,-0.148758,2453 1977,0.00239524,2482 1978,0.0394986,2459 1979,0.17273,2545 1980,0.122466,2531 1981,0.136659,2534 1982,0.0169353,2511 1983,0.325154,2544 1984,0.125968,2558 1985,0.116912,2563 1986,0.0239545,2568 1987,0.266264,2570 1988,0.258206,2549 1989,0.297193,2540 1990,0.221733,2562 1991,0.352842,2566 1992,-0.0909948,2523 1993,0.0450676,2519 1994,0.272813,2554 1995,0.281691,2547 1996,0.203514,2535 1997,0.46836,2550 1998,0.437319,2546 1999,0.277549,2543 2000,0.311935,2532 2001,0.493525,2536 2002,0.503317,2540 2003,0.577039,2539 2004,0.468976,2537 2005,0.6366,2542 2006,0.55222,2547 2007,0.5104,2537 2008,0.548985,2536 2009,0.683173,2559 2010,0.565303,2559 2011,0.539175,2564 2012,0.650178,2539 2013,0.722444,2556 2014,0.757883,2562 2015,0.828779,2561 2016,0.848489,2560 2017,0.731085,2560 2018,0.677699,2554 2019,0.806709,2543 2020,0.869951,2545 2021,0.874615,2563