| Year | Value | | 2022 | 13,090 | | 2021 | 13,210 | | 2020 | 13,544 | | 2019 | 13,475 | | 2018 | 13,031 | | 2017 | 12,145 | | 2016 | 10,840 | | 2015 | 9,591 | | 2014 | 8,469 | | 2013 | 7,496 | | 2012 | 7,062 | | 2011 | 7,236 | | 2010 | 7,523 | | 2009 | 7,618 | | 2008 | 7,468 | | 2007 | 7,208 | | 2006 | 6,966 | | 2005 | 6,663 | | 2004 | 6,346 | | 2003 | 6,122 | | 2002 | 5,935 | | 2001 | 5,772 | | 2000 | 5,686 | | 1999 | 5,672 | | 1998 | 5,691 | | 1997 | 5,714 | | 1996 | 5,713 | | 1995 | 5,688 | | 1994 | 5,599 | | 1993 | 5,433 | | 1992 | 5,224 | | 1991 | 4,980 | | 1990 | 4,624 | | 1989 | 4,370 | | 1988 | 4,204 | | 1987 | 4,142 | | 1986 | 4,161 | | 1985 | 4,197 | | 1984 | 4,251 | | 1983 | 4,370 | | 1982 | 4,434 | | 1981 | 4,444 | | 1980 | 4,476 | | 1979 | 4,454 | | 1978 | 4,370 | | 1977 | 4,231 | | 1976 | 4,074 | | 1975 | 3,889 | | 1974 | 3,694 | | 1973 | 3,545 | | 1972 | 3,426 | | 1971 | 3,339 | | 1970 | 3,289 | | 1969 | 3,288 | | 1968 | 3,317 | | 1967 | 3,345 | | 1966 | 3,366 | | 1965 | 3,369 | | 1964 | 3,336 | | 1963 | 3,271 | | 1962 | 3,190 | | 1961 | 3,094 | | 1960 | 3,006 |
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