Year | Value | 2022 | 67.008040021848 | 2021 | 66.842184349931 | 2020 | 66.649417198632 | 2019 | 66.474443739175 | 2018 | 66.299743427008 | 2017 | 66.134327668534 | 2016 | 65.977907715098 | 2015 | 65.829206544598 | 2014 | 65.68912737344 | 2013 | 65.555540840876 | 2012 | 65.424769265087 | 2011 | 65.292980629105 | 2010 | 65.149243079585 | 2009 | 64.987714855644 | 2008 | 64.814950428429 | 2007 | 64.638797265255 | 2006 | 64.465324377721 | 2005 | 64.297846117708 | 2004 | 64.13208251089 | 2003 | 63.971452641076 | 2002 | 63.819763109571 | 2001 | 63.684904071152 | 2000 | 63.571603134642 | 1999 | 63.482337722685 | 1998 | 63.400489587141 | 1997 | 63.327258663227 | 1996 | 63.264136046803 | 1995 | 63.204340036972 | 1994 | 63.129075879099 | 1993 | 63.05668068911 | 1992 | 62.982293293448 | 1991 | 62.882585085769 | 1990 | 62.739188583168 | 1989 | 62.546578274571 | 1988 | 62.205666713569 | 1987 | 61.737972061867 | 1986 | 61.268270710905 | 1985 | 60.77556496181 | 1984 | 60.237287638118 | 1983 | 59.684169526579 | 1982 | 59.139211788246 | 1981 | 58.591899478004 | 1980 | 58.074214626145 | 1979 | 57.650351766365 | 1978 | 57.141073938955 | 1977 | 56.553859791004 | 1976 | 55.968156293319 | 1975 | 55.371099166189 | 1974 | 54.754276947155 | 1973 | 54.113856492986 | 1972 | 53.467509640183 | 1971 | 52.81628020036 | 1970 | 52.151023815593 | 1969 | 51.463659288281 | 1968 | 50.76678299254 | 1967 | 50.069272703072 | 1966 | 49.372974785928 | 1965 | 48.663345467104 | 1964 | 47.933963461615 | 1963 | 47.217560706197 | 1962 | 46.502231672522 | 1961 | 45.787335082958 | 1960 | 45.04816397992 |
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