Year | Value | 2022 | 59.6 | 2021 | 58.982 | 2020 | 58.359 | 2019 | 57.73 | 2018 | 57.096 | 2017 | 56.457 | 2016 | 55.813 | 2015 | 55.165 | 2014 | 54.514 | 2013 | 53.858 | 2012 | 53.202 | 2011 | 52.543 | 2010 | 51.885 | 2009 | 51.225 | 2008 | 50.566 | 2007 | 49.905 | 2006 | 49.245 | 2005 | 48.585 | 2004 | 47.927 | 2003 | 47.267 | 2002 | 46.61 | 2001 | 45.964 | 2000 | 45.458 | 1999 | 44.952 | 1998 | 44.447 | 1997 | 43.944 | 1996 | 43.442 | 1995 | 42.941 | 1994 | 42.441 | 1993 | 41.943 | 1992 | 41.448 | 1991 | 40.953 | 1990 | 40.46 | 1989 | 39.969 | 1988 | 39.481 | 1987 | 38.907 | 1986 | 38.319 | 1985 | 37.735 | 1984 | 37.155 | 1983 | 36.577 | 1982 | 36.004 | 1981 | 35.435 | 1980 | 34.87 | 1979 | 34.309 | 1978 | 33.752 | 1977 | 33.2 | 1976 | 32.653 | 1975 | 32.11 | 1974 | 31.571 | 1973 | 30.93 | 1972 | 30.246 | 1971 | 29.569 | 1970 | 28.902 | 1969 | 28.244 | 1968 | 27.596 | 1967 | 26.955 | 1966 | 26.325 | 1965 | 25.704 | 1964 | 25.094 | 1963 | 24.491 | 1962 | 23.9 | 1961 | 23.318 | 1960 | 22.747 |
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