Year,Value,NumPoints 1949,-6.16655,1872 1950,-6.0939,1872 1951,-5.91641,1872 1952,-5.81477,1872 1953,-5.82825,1872 1954,-6.00018,1872 1955,-5.98124,1872 1956,-5.95911,1872 1957,-5.75507,1872 1958,-5.41777,1872 1959,-5.53416,1872 1960,-5.62525,1872 1961,-5.50734,1872 1962,-5.56033,1872 1963,-5.6992,1872 1964,-5.90114,1872 1965,-5.82922,1872 1966,-5.57942,1872 1967,-5.58383,1872 1968,-5.52352,1872 1969,-5.29079,1872 1970,-5.27353,1872 1971,-5.41263,1872 1972,-5.34817,1872 1973,-5.02564,1872 1974,-5.0757,1872 1975,-4.80529,1872 1976,-4.91147,1872 1977,-4.79299,1872 1978,-4.68604,1872 1979,-4.61137,1872 1980,-4.73701,1872 1981,-4.70072,1872 1982,-4.9336,1872 1983,-4.88991,1872 1984,-5.0084,1872 1985,-4.8787,1872 1986,-5.03404,1872 1987,-4.82442,1872 1988,-4.74535,1872 1989,-4.64662,1872 1990,-4.68981,1872 1991,-4.86998,1872 1992,-5.07137,1872 1993,-5.06652,1872 1994,-5.10831,1872 1995,-5.11437,1872 1996,-4.93508,1872 1997,-5.01777,1872 1998,-4.56446,1872 1999,-4.73398,1872 2000,-4.80827,1872 2001,-4.48381,1872 2002,-4.58229,1872 2003,-4.68667,1872 2004,-4.63168,1872 2005,-4.57366,1872 2006,-4.45265,1872 2007,-4.49688,1872 2008,-4.50116,1872 2009,-4.41666,1872 2010,-4.05019,1872 2011,-4.21829,1872 2012,-4.32272,1872 2013,-4.22606,1872 2014,-4.09603,1872 2015,-4.34795,1872 2016,-4.10663,1872 2017,-4.11763,1872 2018,-4.37894,1872 2019,-4.19373,1872 2020,-4.20944,1872 2021,-4.23652,1872