| Year | Value | | 2022 | 10,300 | | 2021 | 10,367 | | 2020 | 10,395 | | 2019 | 10,376 | | 2018 | 10,310 | | 2017 | 10,174 | | 2016 | 9,990 | | 2015 | 9,756 | | 2014 | 9,466 | | 2013 | 9,169 | | 2012 | 8,888 | | 2011 | 8,593 | | 2010 | 8,289 | | 2009 | 7,983 | | 2008 | 7,645 | | 2007 | 7,300 | | 2006 | 6,957 | | 2005 | 6,613 | | 2004 | 6,303 | | 2003 | 6,050 | | 2002 | 5,848 | | 2001 | 5,701 | | 2000 | 5,601 | | 1999 | 5,503 | | 1998 | 5,381 | | 1997 | 5,242 | | 1996 | 5,079 | | 1995 | 4,895 | | 1994 | 4,714 | | 1993 | 4,545 | | 1992 | 4,395 | | 1991 | 4,267 | | 1990 | 4,146 | | 1989 | 4,021 | | 1988 | 3,892 | | 1987 | 3,756 | | 1986 | 3,602 | | 1985 | 3,436 | | 1984 | 3,274 | | 1983 | 3,099 | | 1982 | 2,919 | | 1981 | 2,767 | | 1980 | 2,640 | | 1979 | 2,526 | | 1978 | 2,416 | | 1977 | 2,309 | | 1976 | 2,197 | | 1975 | 2,071 | | 1974 | 1,941 | | 1973 | 1,827 | | 1972 | 1,743 | | 1971 | 1,702 | | 1970 | 1,700 | | 1969 | 1,724 | | 1968 | 1,758 | | 1967 | 1,785 | | 1966 | 1,786 | | 1965 | 1,760 | | 1964 | 1,716 | | 1963 | 1,655 | | 1962 | 1,588 | | 1961 | 1,533 | | 1960 | 1,493 |
|