| Year | Value | | 2022 | 7,164 | | 2021 | 7,388 | | 2020 | 7,504 | | 2019 | 7,426 | | 2018 | 7,197 | | 2017 | 6,944 | | 2016 | 6,699 | | 2015 | 6,420 | | 2014 | 6,117 | | 2013 | 5,823 | | 2012 | 5,530 | | 2011 | 5,221 | | 2010 | 4,865 | | 2009 | 4,462 | | 2008 | 4,070 | | 2007 | 3,727 | | 2006 | 3,498 | | 2005 | 3,385 | | 2004 | 3,345 | | 2003 | 3,345 | | 2002 | 3,369 | | 2001 | 3,409 | | 2000 | 3,475 | | 1999 | 3,642 | | 1998 | 3,897 | | 1997 | 4,160 | | 1996 | 4,357 | | 1995 | 4,443 | | 1994 | 4,418 | | 1993 | 4,333 | | 1992 | 4,237 | | 1991 | 4,147 | | 1990 | 4,053 | | 1989 | 3,933 | | 1988 | 3,775 | | 1987 | 3,597 | | 1986 | 3,431 | | 1985 | 3,302 | | 1984 | 3,228 | | 1983 | 3,219 | | 1982 | 3,234 | | 1981 | 3,226 | | 1980 | 3,193 | | 1979 | 3,142 | | 1978 | 3,075 | | 1977 | 2,983 | | 1976 | 2,875 | | 1975 | 2,769 | | 1974 | 2,670 | | 1973 | 2,590 | | 1972 | 2,529 | | 1971 | 2,487 | | 1970 | 2,461 | | 1969 | 2,442 | | 1968 | 2,418 | | 1967 | 2,374 | | 1966 | 2,307 | | 1965 | 2,231 | | 1964 | 2,164 | | 1963 | 2,099 | | 1962 | 2,026 | | 1961 | 1,958 | | 1960 | 1,902 |
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