Year,Value,NumPoints
1881,-0.384883,1082
1882,-0.311897,1125
1883,0.155894,1083
1884,-0.323898,1116
1885,-0.963462,1085
1886,-0.453421,1085
1887,0.103126,1064
1888,-0.567204,1074
1889,-0.507484,1081
1890,-0.495142,1115
1891,-0.263753,1151
1892,-0.49143,1068
1893,-0.294114,1183
1894,-0.470109,1233
1895,0.218019,1188
1896,-0.135748,1227
1897,-0.148744,1278
1898,0.442796,1290
1899,-0.458207,1294
1900,0.603941,1290
1901,0.298245,1309
1902,-0.0202855,1313
1903,-0.329128,1313
1904,-0.22738,1325
1905,0.0747622,1321
1906,-0.185583,1340
1907,-0.615301,1346
1908,-0.186632,1353
1909,-0.135405,1345
1910,-0.0853622,1354
1911,-0.0439526,1309
1912,-0.180265,1381
1913,0.0696458,1379
1914,-0.00908602,1383
1915,-0.71807,1381
1916,-1.08327,1377
1917,-0.913683,1385
1918,-0.390712,1383
1919,0.037775,1375
1920,-0.487699,1383
1921,-0.0281809,1390
1922,-0.348092,1384
1923,-0.0458306,1389
1924,-0.321403,1398
1925,-0.0663545,1398
1926,-0.0756305,1423
1927,-0.408854,1419
1928,-0.35571,1422
1929,-0.592419,1424
1930,0.313905,1430
1931,0.265651,1447
1932,0.133325,1447
1933,0.0216561,1447
1934,0.295217,1446
1935,-0.0393082,1431
1936,0.303783,1447
1937,0.479125,1447
1938,0.216125,1447
1939,0.20363,1447
1940,0.258563,1447
1941,0.225381,1447
1942,-0.265637,1447
1943,0.118005,1447
1944,0.19861,1457
1945,-0.509772,1457
1946,-0.141119,1480
1947,-0.0920067,1480
1948,0.380789,1480
1949,0.0938607,1480
1950,0.0113297,1471
1951,-0.182424,1480
1952,-0.0174109,1471
1953,0.151073,1471
1954,-0.145127,1471
1955,-0.0550994,1575
1956,-0.147008,1595
1957,0.0971127,2011
1958,-0.142486,2011
1959,0.109518,2011
1960,0.180768,2011
1961,0.25122,2011
1962,-0.149326,2011
1963,0.190458,2011
1964,-0.208434,2011
1965,0.168262,2011
1966,0.275875,2011
1967,-0.466425,2011
1968,-0.275968,2011
1969,-0.194805,2011
1970,0.165425,1961
1971,-0.267087,1961
1972,-0.0251879,1961
1973,0.353449,1961
1974,-0.0281321,1961
1975,0.111097,1961
1976,-0.123987,1965
1977,0.52873,1965
1978,-0.230643,1965
1979,-0.140919,1965
1980,0.194572,1961
1981,0.181049,1965
1982,-0.0289579,1965
1983,0.0266747,1965
1984,-0.106708,1965
1985,0.238543,1965
1986,0.147516,1971
1987,0.779912,1971
1988,0.527128,1971
1989,0.306541,1971
1990,0.573339,2011
1991,0.748587,1971
1992,0.310577,1981
1993,0.224286,1981
1994,1.02086,2011
1995,0.90266,2011
1996,0.337952,1981
1997,0.790952,2011
1998,1.12116,2011
1999,0.428428,1981
2000,0.55173,2011
2001,0.645958,1981
2002,0.559727,1981
2003,0.713464,1981
2004,0.529145,1981
2005,1.05103,1981
2006,1.20708,1981
2007,0.953762,2011
2008,0.517621,1981
2009,0.395278,2011
2010,0.929201,2011
2011,0.783796,2011
2012,1.08898,2011
2013,1.17679,2011
2014,0.944884,2011
2015,1.29091,2011
2016,0.986497,2011
2017,1.19739,2011
2018,0.827639,2011
2019,1.2527,2011
2020,1.28424,2011
2021,1.36678,2011
2022,1.04199,2011
2023,1.431,2011