Year,Value,NumPoints
1949,-13.6321,1920
1950,-14.1552,1920
1951,-14.5764,1920
1952,-14.0579,1920
1953,-13.8601,1920
1954,-13.489,1920
1955,-14.5687,1920
1956,-13.8301,1920
1957,-13.5845,1920
1958,-14.2225,1920
1959,-13.5654,1920
1960,-14.0911,1920
1961,-14.6223,1920
1962,-14.2113,1920
1963,-15.2793,1920
1964,-15.4559,1920
1965,-14.1998,1920
1966,-15.3523,1920
1967,-14.2698,1920
1968,-14.4971,1920
1969,-14.4218,1920
1970,-14.2252,1920
1971,-13.9002,1920
1972,-14.0681,1920
1973,-14.0191,1920
1974,-13.8001,1920
1975,-14.3755,1920
1976,-13.8166,1920
1977,-14.1536,1920
1978,-14.5115,1920
1979,-14.6096,1920
1980,-13.0374,1920
1981,-12.3582,1920
1982,-14.4003,1920
1983,-14.1265,1920
1984,-13.508,1920
1985,-13.783,1920
1986,-14.2463,1920
1987,-14.6744,1920
1988,-13.8044,1920
1989,-14.0083,1920
1990,-12.9699,1920
1991,-13.3329,1920
1992,-14.0342,1920
1993,-13.6652,1920
1994,-13.7729,1920
1995,-12.4724,1920
1996,-13.12,1920
1997,-13.1813,1920
1998,-12.5888,1920
1999,-12.8264,1920
2000,-12.4232,1920
2001,-12.726,1920
2002,-12.41,1920
2003,-12.0275,1920
2004,-12.6229,1920
2005,-11.3822,1920
2006,-11.225,1920
2007,-11.4383,1920
2008,-12.2148,1920
2009,-11.8646,1920
2010,-11.2,1920
2011,-11.3991,1920
2012,-10.9529,1920
2013,-12.1348,1920
2014,-11.2295,1920
2015,-11.4566,1920
2016,-9.40477,1920
2017,-10.7326,1920
2018,-10.8335,1920
2019,-10.8459,1920