| Year | Value | | 2022 | 15,194 | | 2021 | 14,462 | | 2020 | 13,721 | | 2019 | 12,982 | | 2018 | 12,397 | | 2017 | 12,080 | | 2016 | 11,941 | | 2015 | 11,822 | | 2014 | 11,651 | | 2013 | 11,418 | | 2012 | 11,073 | | 2011 | 10,622 | | 2010 | 10,178 | | 2009 | 9,802 | | 2008 | 9,549 | | 2007 | 9,479 | | 2006 | 9,591 | | 2005 | 9,760 | | 2004 | 9,831 | | 2003 | 9,748 | | 2002 | 9,488 | | 2001 | 9,070 | | 2000 | 8,554 | | 1999 | 8,004 | | 1998 | 7,478 | | 1997 | 7,086 | | 1996 | 6,763 | | 1995 | 6,533 | | 1994 | 6,445 | | 1993 | 6,411 | | 1992 | 6,345 | | 1991 | 6,202 | | 1990 | 6,021 | | 1989 | 5,792 | | 1988 | 5,540 | | 1987 | 5,353 | | 1986 | 5,205 | | 1985 | 5,045 | | 1984 | 4,886 | | 1983 | 4,728 | | 1982 | 4,569 | | 1981 | 4,416 | | 1980 | 4,289 | | 1979 | 4,152 | | 1978 | 3,994 | | 1977 | 3,855 | | 1976 | 3,709 | | 1975 | 3,560 | | 1974 | 3,418 | | 1973 | 3,299 | | 1972 | 3,205 | | 1971 | 3,119 | | 1970 | 3,035 | | 1969 | 2,955 | | 1968 | 2,867 | | 1967 | 2,766 | | 1966 | 2,652 | | 1965 | 2,534 | | 1964 | 2,432 | | 1963 | 2,363 | | 1962 | 2,290 | | 1961 | 2,170 | | 1960 | 2,080 |
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