| Year | Value | | 2022 | 7,087 | | 2021 | 7,028 | | 2020 | 6,950 | | 2019 | 6,856 | | 2018 | 6,762 | | 2017 | 6,670 | | 2016 | 6,588 | | 2015 | 6,524 | | 2014 | 6,470 | | 2013 | 6,418 | | 2012 | 6,367 | | 2011 | 6,320 | | 2010 | 6,272 | | 2009 | 6,237 | | 2008 | 6,210 | | 2007 | 6,176 | | 2006 | 6,142 | | 2005 | 6,104 | | 2004 | 6,056 | | 2003 | 5,988 | | 2002 | 5,877 | | 2001 | 5,714 | | 2000 | 5,534 | | 1999 | 5,354 | | 1998 | 5,159 | | 1997 | 4,943 | | 1996 | 4,710 | | 1995 | 4,474 | | 1994 | 4,245 | | 1993 | 4,037 | | 1992 | 3,855 | | 1991 | 3,688 | | 1990 | 3,531 | | 1989 | 3,384 | | 1988 | 3,243 | | 1987 | 3,110 | | 1986 | 2,983 | | 1985 | 2,857 | | 1984 | 2,734 | | 1983 | 2,614 | | 1982 | 2,493 | | 1981 | 2,374 | | 1980 | 2,265 | | 1979 | 2,162 | | 1978 | 2,064 | | 1977 | 1,973 | | 1976 | 1,893 | | 1975 | 1,822 | | 1974 | 1,764 | | 1973 | 1,716 | | 1972 | 1,671 | | 1971 | 1,637 | | 1970 | 1,617 | | 1969 | 1,629 | | 1968 | 1,670 | | 1967 | 1,719 | | 1966 | 1,770 | | 1965 | 1,817 | | 1964 | 1,859 | | 1963 | 1,899 | | 1962 | 1,934 | | 1961 | 1,964 | | 1960 | 1,989 |
|