| Year | Value | | 2022 | 4,978 | | 2021 | 4,878 | | 2020 | 4,748 | | 2019 | 4,605 | | 2018 | 4,459 | | 2017 | 4,258 | | 2016 | 4,072 | | 2015 | 3,962 | | 2014 | 3,900 | | 2013 | 3,899 | | 2012 | 3,954 | | 2011 | 4,030 | | 2010 | 4,078 | | 2009 | 4,155 | | 2008 | 4,244 | | 2007 | 4,244 | | 2006 | 4,195 | | 2005 | 4,142 | | 2004 | 4,117 | | 2003 | 4,125 | | 2002 | 4,161 | | 2001 | 4,175 | | 2000 | 4,145 | | 1999 | 4,105 | | 1998 | 4,051 | | 1997 | 3,969 | | 1996 | 3,880 | | 1995 | 3,794 | | 1994 | 3,757 | | 1993 | 3,778 | | 1992 | 3,780 | | 1991 | 3,739 | | 1990 | 3,682 | | 1989 | 3,625 | | 1988 | 3,569 | | 1987 | 3,481 | | 1986 | 3,361 | | 1985 | 3,243 | | 1984 | 3,124 | | 1983 | 3,007 | | 1982 | 2,898 | | 1981 | 2,798 | | 1980 | 2,711 | | 1979 | 2,595 | | 1978 | 2,451 | | 1977 | 2,301 | | 1976 | 2,145 | | 1975 | 1,998 | | 1974 | 1,916 | | 1973 | 1,897 | | 1972 | 1,885 | | 1971 | 1,877 | | 1970 | 1,855 | | 1969 | 1,821 | | 1968 | 1,790 | | 1967 | 1,760 | | 1966 | 1,728 | | 1965 | 1,693 | | 1964 | 1,658 | | 1963 | 1,624 | | 1962 | 1,580 | | 1961 | 1,529 | | 1960 | 1,479 |
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