| Year | Value | | 2022 | 9,684 | | 2021 | 9,507 | | 2020 | 9,911 | | 2019 | 10,617 | | 2018 | 11,168 | | 2017 | 11,572 | | 2016 | 11,795 | | 2015 | 11,752 | | 2014 | 11,455 | | 2013 | 11,066 | | 2012 | 10,717 | | 2011 | 10,455 | | 2010 | 10,260 | | 2009 | 10,130 | | 2008 | 10,006 | | 2007 | 9,803 | | 2006 | 9,401 | | 2005 | 8,731 | | 2004 | 7,860 | | 2003 | 6,949 | | 2002 | 6,155 | | 2001 | 5,635 | | 2000 | 5,398 | | 1999 | 5,372 | | 1998 | 5,420 | | 1997 | 5,499 | | 1996 | 5,648 | | 1995 | 5,915 | | 1994 | 6,334 | | 1993 | 6,817 | | 1992 | 7,257 | | 1991 | 7,563 | | 1990 | 7,646 | | 1989 | 7,537 | | 1988 | 7,288 | | 1987 | 6,958 | | 1986 | 6,590 | | 1985 | 6,181 | | 1984 | 5,745 | | 1983 | 5,333 | | 1982 | 4,989 | | 1981 | 4,750 | | 1980 | 4,664 | | 1979 | 4,727 | | 1978 | 4,876 | | 1977 | 5,036 | | 1976 | 5,145 | | 1975 | 5,154 | | 1974 | 5,043 | | 1973 | 4,844 | | 1972 | 4,615 | | 1971 | 4,412 | | 1970 | 4,287 | | 1969 | 4,254 | | 1968 | 4,286 | | 1967 | 4,340 | | 1966 | 4,358 | | 1965 | 4,305 | | 1964 | 4,178 | | 1963 | 4,001 | | 1962 | 3,813 | | 1961 | 3,655 | | 1960 | 3,547 |
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