Year | Value | 2022 | 48.725158497927 | 2021 | 48.670794729736 | 2020 | 48.626871100638 | 2019 | 48.607142569683 | 2018 | 48.618120250939 | 2017 | 48.639936192486 | 2016 | 48.667234818121 | 2015 | 48.697164694491 | 2014 | 48.738531112754 | 2013 | 48.79049695087 | 2012 | 48.83979286495 | 2011 | 48.883690873843 | 2010 | 48.928191119959 | 2009 | 48.960338125967 | 2008 | 48.977550353 | 2007 | 48.988215455205 | 2006 | 48.996333043574 | 2005 | 49.027138258425 | 2004 | 49.061564682408 | 2003 | 49.071069542534 | 2002 | 49.075757575758 | 2001 | 49.12460924987 | 2000 | 49.174791164749 | 1999 | 49.207803961553 | 1998 | 49.259367169745 | 1997 | 49.309674052284 | 1996 | 49.366186980877 | 1995 | 49.391882770216 | 1994 | 49.385776936111 | 1993 | 49.379843981136 | 1992 | 49.372922042079 | 1991 | 49.359108233697 | 1990 | 49.399659230073 | 1989 | 49.474372242497 | 1988 | 49.51171875 | 1987 | 49.543933891859 | 1986 | 49.578120880087 | 1985 | 49.589254662109 | 1984 | 49.585233707796 | 1983 | 49.601534598649 | 1982 | 49.621290312336 | 1981 | 49.645252525253 | 1980 | 49.665367602322 | 1979 | 49.676286072773 | 1978 | 49.647691919617 | 1977 | 49.580926303135 | 1976 | 49.50754435417 | 1975 | 49.430572723527 | 1974 | 49.356061227503 | 1973 | 49.34651308624 | 1972 | 49.409455423951 | 1971 | 49.467839753993 | 1970 | 49.523826105124 | 1969 | 49.580995667921 | 1968 | 49.606384320225 | 1967 | 49.601745771958 | 1966 | 49.599470860587 | 1965 | 49.573385225657 | 1964 | 49.520079858711 | 1963 | 49.458448207956 | 1962 | 49.392017451725 | 1961 | 49.323666494045 | 1960 | 49.253604569681 |
|