| Year | Value | | 2022 | 8,327 | | 2021 | 7,841 | | 2020 | 7,513 | | 2019 | 7,370 | | 2018 | 7,213 | | 2017 | 7,043 | | 2016 | 6,945 | | 2015 | 6,890 | | 2014 | 6,673 | | 2013 | 6,473 | | 2012 | 6,346 | | 2011 | 6,298 | | 2010 | 6,380 | | 2009 | 6,444 | | 2008 | 6,461 | | 2007 | 6,474 | | 2006 | 6,334 | | 2005 | 5,968 | | 2004 | 5,542 | | 2003 | 5,131 | | 2002 | 4,695 | | 2001 | 4,330 | | 2000 | 4,136 | | 1999 | 4,028 | | 1998 | 3,858 | | 1997 | 3,657 | | 1996 | 3,514 | | 1995 | 3,406 | | 1994 | 3,450 | | 1993 | 3,651 | | 1992 | 3,913 | | 1991 | 4,114 | | 1990 | 4,185 | | 1989 | 4,159 | | 1988 | 4,140 | | 1987 | 4,152 | | 1986 | 4,124 | | 1985 | 4,072 | | 1984 | 4,011 | | 1983 | 3,950 | | 1982 | 3,829 | | 1981 | 3,732 | | 1980 | 3,685 | | 1979 | 3,602 | | 1978 | 3,544 | | 1977 | 3,499 | | 1976 | 3,434 | | 1975 | 3,345 | | 1974 | 3,256 | | 1973 | 3,190 | | 1972 | 3,107 | | 1971 | 3,025 | | 1970 | 2,964 | | 1969 | 2,892 | | 1968 | 2,840 | | 1967 | 2,819 | | 1966 | 2,819 | | 1965 | 2,833 | | 1964 | 2,825 | | 1963 | 2,792 | | 1962 | 2,783 | | 1961 | 2,759 | | 1960 | 2,728 |
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