Year | Value | 2022 | 29.17 | 2021 | 29.525 | 2020 | 29.877 | 2019 | 30.227 | 2018 | 30.575 | 2017 | 30.92 | 2016 | 31.262 | 2015 | 31.607 | 2014 | 31.953 | 2013 | 32.301 | 2012 | 32.685 | 2011 | 33.126 | 2010 | 33.57 | 2009 | 34.016 | 2008 | 34.465 | 2007 | 34.918 | 2006 | 35.372 | 2005 | 35.83 | 2004 | 36.289 | 2003 | 36.752 | 2002 | 37.217 | 2001 | 37.694 | 2000 | 38.213 | 1999 | 38.736 | 1998 | 39.261 | 1997 | 39.788 | 1996 | 40.318 | 1995 | 40.85 | 1994 | 41.385 | 1993 | 41.921 | 1992 | 42.459 | 1991 | 43.421 | 1990 | 44.423 | 1989 | 45.429 | 1988 | 46.437 | 1987 | 47.451 | 1986 | 48.465 | 1985 | 49.481 | 1984 | 50.496 | 1983 | 51.514 | 1982 | 52.528 | 1981 | 53.541 | 1980 | 54.549 | 1979 | 55.557 | 1978 | 56.558 | 1977 | 57.554 | 1976 | 58.376 | 1975 | 58.686 | 1974 | 58.996 | 1973 | 59.304 | 1972 | 59.611 | 1971 | 59.918 | 1970 | 60.224 | 1969 | 60.53 | 1968 | 60.834 | 1967 | 61.138 | 1966 | 61.441 | 1965 | 61.743 | 1964 | 62.043 | 1963 | 62.344 | 1962 | 62.643 | 1961 | 62.941 | 1960 | 63.238 |
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