Year,Value,NumPoints 1900,-1.36746,53 1901,0.0773329,54 1902,-2.43563,54 1903,0.424953,55 1904,-0.450887,55 1905,0.764411,54 1906,-0.685929,52 1907,-1.004,55 1908,-0.714176,53 1909,-0.822437,56 1910,0.413093,55 1911,-0.997634,55 1912,-1.20814,58 1913,-0.615645,59 1914,-0.758729,60 1915,-0.910929,59 1916,-0.236245,60 1917,-1.92749,60 1918,-1.74087,59 1919,-1.95277,58 1920,0.797902,60 1921,0.0193769,62 1922,-0.530493,67 1923,0.287506,68 1924,0.151746,71 1925,-0.0418271,68 1926,1.5019,70 1927,-0.271054,74 1928,1.02899,76 1929,-0.141005,80 1930,0.580463,81 1931,-0.503279,83 1932,0.43414,84 1933,-1.03419,93 1934,1.78257,98 1935,1.16589,101 1936,-1.3355,111 1937,1.34775,118 1938,1.47243,117 1939,0.270016,121 1940,-0.00955041,127 1941,-1.64468,125 1942,-0.166883,126 1943,1.64004,131 1944,2.02706,128 1945,0.528307,134 1946,-0.923138,136 1947,-0.13256,140 1948,0.37715,144 1949,0.961774,149 1950,0.0911184,155 1951,-1.54492,157 1952,-0.524189,157 1953,0.158657,160 1954,-0.14453,161 1955,-0.69193,163 1956,0.245101,165 1957,0.302837,166 1958,-0.445806,169 1959,1.02313,176 1960,-0.577532,178 1961,0.10887,179 1962,1.51922,181 1963,0.132674,178 1964,-0.871776,178 1965,-0.478416,178 1966,-3.25741,179 1967,-0.0376636,178 1968,0.935309,179 1969,-1.80983,180 1970,0.0366547,180 1971,-0.89005,180 1972,-0.851395,179 1973,0.158115,179 1974,-0.491606,178 1975,0.572914,180 1976,-0.664876,182 1977,-0.0237174,180 1978,0.541691,181 1979,-2.00467,181 1980,0.869433,180 1981,2.36543,176 1982,-0.411795,174 1983,0.657609,175 1984,0.800075,172 1985,-0.21985,177 1986,0.729947,177 1987,-0.511785,177 1988,1.10104,177 1989,1.44371,175 1990,0.561111,176 1991,0.344111,176 1992,1.40102,173 1993,1.9154,174 1994,-0.151084,167 1995,2.51026,172 1996,1.85446,165 1997,0.83834,165 1998,0.272178,162 1999,-0.235283,163 2000,1.8243,160 2001,0.636966,165 2002,1.19166,164 2003,1.63148,162 2004,0.499313,165 2005,2.03148,159 2006,1.00538,163 2007,1.7973,161 2008,1.7684,159 2009,0.535157,154 2010,1.0302,153 2011,2.12539,154 2012,1.54132,154 2013,0.566111,153 2014,2.36146,148 2015,2.64658,149 2016,4.07406,142 2017,3.74379,134 2018,2.34295,129 2019,3.40921,116 2020,3.48089,118 2021,0.484569,116