Year,Value,NumPoints
1949,-31.2382,1920
1950,-29.9935,1920
1951,-33.9109,1920
1952,-29.5017,1920
1953,-29.9123,1920
1954,-28.9514,1920
1955,-28.6882,1920
1956,-28.023,1920
1957,-27.7783,1920
1958,-26.7943,1920
1959,-28.1906,1920
1960,-27.6309,1920
1961,-29.1881,1920
1962,-28.4746,1920
1963,-30.2031,1920
1964,-31.9421,1920
1965,-29.0819,1920
1966,-31.9696,1920
1967,-30.2461,1920
1968,-28.5891,1920
1969,-27.8619,1920
1970,-27.6986,1920
1971,-31.2383,1920
1972,-26.9078,1920
1973,-26.9474,1920
1974,-25.774,1920
1975,-29.9497,1920
1976,-27.9079,1920
1977,-24.8399,1920
1978,-28.8341,1920
1979,-28.3751,1920
1980,-25.9915,1920
1981,-25.3209,1920
1982,-29.3788,1920
1983,-28.5932,1920
1984,-25.8456,1920
1985,-26.2959,1920
1986,-29.3015,1920
1987,-27.9214,1920
1988,-27.924,1920
1989,-31.1753,1920
1990,-25.8164,1920
1991,-26.8301,1920
1992,-29.1922,1920
1993,-29.1643,1920
1994,-28.3218,1920
1995,-27.8975,1920
1996,-27.6266,1920
1997,-30.3667,1920
1998,-25.9278,1920
1999,-27.2738,1920
2000,-26.1098,1920
2001,-26.1754,1920
2002,-26.8281,1920
2003,-25.8762,1920
2004,-26.4588,1920
2005,-23.0023,1920
2006,-23.3366,1920
2007,-26.319,1920
2008,-27.282,1920
2009,-24.4322,1920
2010,-26.0698,1920
2011,-24.9706,1920
2012,-24.5497,1920
2013,-25.3448,1920
2014,-25.0522,1920
2015,-25.9582,1920
2016,-20.227,1920
2017,-23.1508,1920
2018,-23.6228,1920
2019,-27.1434,1920
2020,-27.1926,1920