Year | Value | 2021 | 59.941 | 2020 | 60.351 | 2019 | 60.59 | 2018 | 59.94 | 2017 | 59.723 | 2016 | 59.069 | 2015 | 58.947 | 2014 | 58.263 | 2013 | 58.024 | 2012 | 57.339 | 2011 | 56.747 | 2010 | 56.212 | 2009 | 55.599 | 2008 | 54.771 | 2007 | 54.001 | 2006 | 53.389 | 2005 | 52.899 | 2004 | 52.505 | 2003 | 52.268 | 2002 | 52.163 | 2001 | 52.184 | 2000 | 52.346 | 1999 | 52.516 | 1998 | 52.973 | 1997 | 53.528 | 1996 | 53.923 | 1995 | 54.034 | 1994 | 54.143 | 1993 | 54.278 | 1992 | 54.495 | 1991 | 54.665 | 1990 | 54.913 | 1989 | 55.126 | 1988 | 55.272 | 1987 | 55.454 | 1986 | 55.411 | 1985 | 55.322 | 1984 | 55.185 | 1983 | 55.567 | 1982 | 55.301 | 1981 | 55.124 | 1980 | 54.489 | 1979 | 53.837 | 1978 | 53.02 | 1977 | 52.096 | 1976 | 51.121 | 1975 | 49.978 | 1974 | 49.083 | 1973 | 48.023 | 1972 | 47.171 | 1971 | 46.458 | 1970 | 45.796 | 1969 | 45.118 | 1968 | 44.483 | 1967 | 43.977 | 1966 | 43.347 | 1965 | 42.743 | 1964 | 42.217 | 1963 | 41.572 | 1962 | 40.998 | 1961 | 40.336 | 1960 | 39.754 |
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