Year | Value | 2022 | 21.911 | 2021 | 22.205 | 2020 | 22.477 | 2019 | 22.748 | 2018 | 22.982 | 2017 | 23.276 | 2016 | 23.516 | 2015 | 23.889 | 2014 | 24.207 | 2013 | 24.66 | 2012 | 25.06 | 2011 | 25.521 | 2010 | 26.118 | 2009 | 26.79 | 2008 | 27.434 | 2007 | 28.331 | 2006 | 29.167 | 2005 | 30.226 | 2004 | 31.142 | 2003 | 32.15 | 2002 | 32.788 | 2001 | 33.123 | 2000 | 33.233 | 1999 | 33.369 | 1998 | 33.376 | 1997 | 33.71 | 1996 | 34.66 | 1995 | 35.616 | 1994 | 36.56 | 1993 | 37.207 | 1992 | 37.673 | 1991 | 38.177 | 1990 | 38.749 | 1989 | 39.142 | 1988 | 39.511 | 1987 | 39.875 | 1986 | 40.183 | 1985 | 40.472 | 1984 | 40.918 | 1983 | 41.383 | 1982 | 41.824 | 1981 | 42.268 | 1980 | 42.804 | 1979 | 43.322 | 1978 | 43.805 | 1977 | 44.263 | 1976 | 44.658 | 1975 | 45.103 | 1974 | 45.471 |
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