Year | Value | 2021 | 66.537 | 2020 | 67.502 | 2019 | 67.254 | 2018 | 66.811 | 2017 | 66.328 | 2016 | 65.881 | 2015 | 65.534 | 2014 | 65.074 | 2013 | 64.594 | 2012 | 64.112 | 2011 | 63.546 | 2010 | 63.01 | 2009 | 62.57 | 2008 | 62.182 | 2007 | 61.71 | 2006 | 61.204 | 2005 | 60.376 | 2004 | 60.379 | 2003 | 59.813 | 2002 | 59.49 | 2001 | 59.714 | 2000 | 60.028 | 1999 | 59.947 | 1998 | 59.137 | 1997 | 58.102 | 1996 | 57.62 | 1995 | 58.102 | 1994 | 57.711 | 1993 | 57.355 | 1992 | 56.969 | 1991 | 56.599 | 1990 | 56.156 | 1989 | 55.763 | 1988 | 55.322 | 1987 | 54.864 | 1986 | 54.434 | 1985 | 54.3 | 1984 | 54.269 | 1983 | 53.846 | 1982 | 53.432 | 1981 | 53.398 | 1980 | 53.372 | 1979 | 53.353 | 1978 | 53.378 | 1977 | 53.399 | 1976 | 53.402 | 1975 | 53.748 | 1974 | 53.312 | 1973 | 52.72 | 1972 | 52.106 | 1971 | 51.359 | 1970 | 50.671 | 1969 | 50.068 | 1968 | 49.614 | 1967 | 49.05 | 1966 | 48.378 | 1965 | 47.772 | 1964 | 47.059 | 1963 | 46.122 | 1962 | 45.096 | 1961 | 43.973 | 1960 | 42.816 |
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