Year | Value | 2022 | 77.719651215741 | 2021 | 77.475963186317 | 2020 | 77.231623116569 | 2019 | 76.997157434096 | 2018 | 76.756047330455 | 2017 | 76.529535574026 | 2016 | 76.308162706494 | 2015 | 76.091693691004 | 2014 | 75.877573036934 | 2013 | 75.676607615481 | 2012 | 75.469752009754 | 2011 | 75.254199108399 | 2010 | 75.027414294434 | 2009 | 74.796353938821 | 2008 | 74.568354006592 | 2007 | 74.341352480225 | 2006 | 74.111999668758 | 2005 | 73.873958648794 | 2004 | 73.63091060641 | 2003 | 73.385143348981 | 2002 | 73.13432168296 | 2001 | 72.890696977683 | 2000 | 72.674541130924 | 1999 | 72.48200143729 | 1998 | 72.303180207829 | 1997 | 72.130000086997 | 1996 | 71.953581937304 | 1995 | 71.772330773372 | 1994 | 71.591121401889 | 1993 | 71.410377078835 | 1992 | 71.245566029497 | 1991 | 71.087007999228 | 1990 | 70.912740688242 | 1989 | 70.762003037396 | 1988 | 70.650394094136 | 1987 | 70.488430475811 | 1986 | 70.317384377173 | 1985 | 70.22490386835 | 1984 | 70.168715676771 | 1983 | 70.097437966873 | 1982 | 69.985847495733 | 1981 | 69.827721495504 | 1980 | 69.582793391594 | 1979 | 69.334353576802 | 1978 | 69.084434049336 | 1977 | 68.833148805682 | 1976 | 68.583832329771 | 1975 | 68.355115871178 | 1974 | 68.094948921006 | 1973 | 67.787793145803 | 1972 | 67.46918557898 | 1971 | 67.128462609731 | 1970 | 66.728275784694 | 1969 | 66.306970415407 | 1968 | 65.875398569366 | 1967 | 65.369361278524 | 1966 | 64.81748163236 | 1965 | 64.25937294259 | 1964 | 63.699810910574 | 1963 | 63.138916496209 | 1962 | 62.577022515456 | 1961 | 62.081029371629 | 1960 | 61.598191607379 |
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