Year | Value | 2021 | 61.982 | 2020 | 62.575 | 2019 | 63.565 | 2018 | 63.081 | 2017 | 63.016 | 2016 | 63.136 | 2015 | 62.659 | 2014 | 62.545 | 2013 | 62.417 | 2012 | 61.923 | 2011 | 61.419 | 2010 | 60.851 | 2009 | 60.364 | 2008 | 59.852 | 2007 | 59.111 | 2006 | 58.684 | 2005 | 58.361 | 2004 | 57.944 | 2003 | 57.344 | 2002 | 56.454 | 2001 | 55.798 | 2000 | 55.298 | 1999 | 54.846 | 1998 | 52.943 | 1997 | 53.634 | 1996 | 53.243 | 1995 | 52.544 | 1994 | 51.495 | 1993 | 51.466 | 1992 | 47.596 | 1991 | 46.663 | 1990 | 45.967 | 1989 | 45.158 | 1988 | 43.958 | 1987 | 39.844 | 1986 | 39.396 | 1985 | 33.55 | 1984 | 33.329 | 1983 | 38.187 | 1982 | 37.766 | 1981 | 40.164 | 1980 | 39.618 | 1979 | 39.086 | 1978 | 40.271 | 1977 | 41.228 | 1976 | 40.645 | 1975 | 40.1 | 1974 | 39.55 | 1973 | 39.003 | 1972 | 38.444 | 1971 | 37.923 | 1970 | 37.418 | 1969 | 36.91 | 1968 | 36.418 | 1967 | 35.924 | 1966 | 35.453 | 1965 | 34.953 | 1964 | 34.494 | 1963 | 34.016 | 1962 | 33.547 | 1961 | 33.068 | 1960 | 32.535 |
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