| Year | Value | | 2022 | 4,389 | | 2021 | 4,459 | | 2020 | 4,553 | | 2019 | 4,702 | | 2018 | 4,904 | | 2017 | 5,114 | | 2016 | 5,309 | | 2015 | 5,478 | | 2014 | 5,604 | | 2013 | 5,684 | | 2012 | 5,730 | | 2011 | 5,750 | | 2010 | 5,752 | | 2009 | 5,766 | | 2008 | 5,800 | | 2007 | 5,834 | | 2006 | 5,860 | | 2005 | 5,859 | | 2004 | 5,812 | | 2003 | 5,719 | | 2002 | 5,598 | | 2001 | 5,467 | | 2000 | 5,336 | | 1999 | 5,206 | | 1998 | 5,081 | | 1997 | 4,968 | | 1996 | 4,867 | | 1995 | 4,778 | | 1994 | 4,688 | | 1993 | 4,573 | | 1992 | 4,426 | | 1991 | 4,225 | | 1990 | 3,943 | | 1989 | 3,646 | | 1988 | 3,388 | | 1987 | 3,144 | | 1986 | 2,934 | | 1985 | 2,807 | | 1984 | 2,746 | | 1983 | 2,717 | | 1982 | 2,694 | | 1981 | 2,634 | | 1980 | 2,522 | | 1979 | 2,405 | | 1978 | 2,336 | | 1977 | 2,295 | | 1976 | 2,246 | | 1975 | 2,194 | | 1974 | 2,144 | | 1973 | 2,081 | | 1972 | 2,009 | | 1971 | 1,937 | | 1970 | 1,857 | | 1969 | 1,775 | | 1968 | 1,704 | | 1967 | 1,648 | | 1966 | 1,601 | | 1965 | 1,567 | | 1964 | 1,536 | | 1963 | 1,504 | | 1962 | 1,466 | | 1961 | 1,419 | | 1960 | 1,369 |
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