| Year | Value | | 2022 | 11,022 | | 2021 | 10,752 | | 2020 | 10,515 | | 2019 | 10,416 | | 2018 | 10,592 | | 2017 | 10,929 | | 2016 | 11,298 | | 2015 | 11,696 | | 2014 | 12,011 | | 2013 | 12,248 | | 2012 | 12,383 | | 2011 | 12,398 | | 2010 | 12,437 | | 2009 | 12,515 | | 2008 | 12,515 | | 2007 | 12,424 | | 2006 | 12,216 | | 2005 | 11,784 | | 2004 | 11,235 | | 2003 | 10,700 | | 2002 | 10,249 | | 2001 | 9,873 | | 2000 | 9,592 | | 1999 | 9,478 | | 1998 | 9,504 | | 1997 | 9,563 | | 1996 | 9,630 | | 1995 | 9,739 | | 1994 | 9,856 | | 1993 | 9,941 | | 1992 | 9,982 | | 1991 | 9,988 | | 1990 | 9,953 | | 1989 | 9,875 | | 1988 | 9,736 | | 1987 | 9,511 | | 1986 | 9,207 | | 1985 | 8,842 | | 1984 | 8,430 | | 1983 | 8,040 | | 1982 | 7,683 | | 1981 | 7,333 | | 1980 | 7,009 | | 1979 | 6,700 | | 1978 | 6,393 | | 1977 | 6,096 | | 1976 | 5,805 | | 1975 | 5,507 | | 1974 | 5,213 | | 1973 | 4,947 | | 1972 | 4,711 | | 1971 | 4,528 | | 1970 | 4,414 | | 1969 | 4,334 | | 1968 | 4,260 | | 1967 | 4,198 | | 1966 | 4,146 | | 1965 | 4,082 | | 1964 | 4,007 | | 1963 | 3,920 | | 1962 | 3,840 | | 1961 | 3,788 | | 1960 | 3,741 |
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