| Year | Value | | 2022 | 13,017 | | 2021 | 12,382 | | 2020 | 11,797 | | 2019 | 11,202 | | 2018 | 10,712 | | 2017 | 10,490 | | 2016 | 10,486 | | 2015 | 10,599 | | 2014 | 10,793 | | 2013 | 10,925 | | 2012 | 10,831 | | 2011 | 10,561 | | 2010 | 10,237 | | 2009 | 9,919 | | 2008 | 9,627 | | 2007 | 9,378 | | 2006 | 9,188 | | 2005 | 9,049 | | 2004 | 8,951 | | 2003 | 8,898 | | 2002 | 8,874 | | 2001 | 8,846 | | 2000 | 8,799 | | 1999 | 8,738 | | 1998 | 8,656 | | 1997 | 8,550 | | 1996 | 8,437 | | 1995 | 8,329 | | 1994 | 8,231 | | 1993 | 8,131 | | 1992 | 7,986 | | 1991 | 7,773 | | 1990 | 7,510 | | 1989 | 7,215 | | 1988 | 6,888 | | 1987 | 6,550 | | 1986 | 6,249 | | 1985 | 6,014 | | 1984 | 5,841 | | 1983 | 5,641 | | 1982 | 5,414 | | 1981 | 5,213 | | 1980 | 4,995 | | 1979 | 4,763 | | 1978 | 4,532 | | 1977 | 4,303 | | 1976 | 4,080 | | 1975 | 3,873 | | 1974 | 3,677 | | 1973 | 3,525 | | 1972 | 3,414 | | 1971 | 3,307 | | 1970 | 3,204 | | 1969 | 3,106 | | 1968 | 3,011 | | 1967 | 2,920 | | 1966 | 2,835 | | 1965 | 2,751 | | 1964 | 2,670 | | 1963 | 2,592 | | 1962 | 2,516 | | 1961 | 2,442 | | 1960 | 2,370 |
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