| Year | Value | | 2022 | 13,922 | | 2021 | 14,144 | | 2020 | 14,591 | | 2019 | 14,599 | | 2018 | 14,165 | | 2017 | 13,219 | | 2016 | 11,862 | | 2015 | 10,591 | | 2014 | 9,507 | | 2013 | 8,645 | | 2012 | 8,329 | | 2011 | 8,598 | | 2010 | 8,974 | | 2009 | 9,148 | | 2008 | 9,109 | | 2007 | 8,985 | | 2006 | 8,871 | | 2005 | 8,711 | | 2004 | 8,522 | | 2003 | 8,332 | | 2002 | 8,079 | | 2001 | 7,790 | | 2000 | 7,563 | | 1999 | 7,397 | | 1998 | 7,323 | | 1997 | 7,300 | | 1996 | 7,228 | | 1995 | 7,119 | | 1994 | 6,978 | | 1993 | 6,722 | | 1992 | 6,402 | | 1991 | 6,080 | | 1990 | 5,636 | | 1989 | 5,354 | | 1988 | 5,199 | | 1987 | 5,160 | | 1986 | 5,207 | | 1985 | 5,233 | | 1984 | 5,266 | | 1983 | 5,415 | | 1982 | 5,515 | | 1981 | 5,562 | | 1980 | 5,639 | | 1979 | 5,649 | | 1978 | 5,601 | | 1977 | 5,490 | | 1976 | 5,356 | | 1975 | 5,154 | | 1974 | 4,896 | | 1973 | 4,672 | | 1972 | 4,462 | | 1971 | 4,306 | | 1970 | 4,223 | | 1969 | 4,229 | | 1968 | 4,295 | | 1967 | 4,373 | | 1966 | 4,434 | | 1965 | 4,431 | | 1964 | 4,352 | | 1963 | 4,220 | | 1962 | 4,048 | | 1961 | 3,865 | | 1960 | 3,703 |
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