| Year | Value | | 2022 | 2,428 | | 2021 | 2,465 | | 2020 | 2,517 | | 2019 | 2,617 | | 2018 | 2,758 | | 2017 | 2,892 | | 2016 | 3,011 | | 2015 | 3,105 | | 2014 | 3,165 | | 2013 | 3,193 | | 2012 | 3,208 | | 2011 | 3,225 | | 2010 | 3,259 | | 2009 | 3,338 | | 2008 | 3,450 | | 2007 | 3,542 | | 2006 | 3,579 | | 2005 | 3,531 | | 2004 | 3,434 | | 2003 | 3,320 | | 2002 | 3,195 | | 2001 | 3,109 | | 2000 | 3,112 | | 1999 | 3,152 | | 1998 | 3,148 | | 1997 | 3,091 | | 1996 | 2,971 | | 1995 | 2,818 | | 1994 | 2,821 | | 1993 | 3,019 | | 1992 | 3,230 | | 1991 | 3,478 | | 1990 | 3,783 | | 1989 | 4,024 | | 1988 | 4,377 | | 1987 | 4,651 | | 1986 | 4,723 | | 1985 | 4,590 | | 1984 | 4,373 | | 1983 | 4,117 | | 1982 | 3,869 | | 1981 | 3,766 | | 1980 | 3,776 | | 1979 | 3,664 | | 1978 | 3,675 | | 1977 | 3,584 | | 1976 | 3,685 | | 1975 | 3,607 | | 1974 | 3,478 | | 1973 | 3,369 | | 1972 | 3,205 | | 1971 | 3,147 | | 1970 | 2,980 | | 1969 | 2,885 | | 1968 | 2,582 | | 1967 | 2,158 | | 1966 | 1,892 | | 1965 | 1,640 | | 1964 | 1,465 | | 1963 | 1,418 | | 1962 | 1,231 | | 1961 | 1,189 | | 1960 | 1,102 |
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