| Year | Value | | 2022 | 11,277 | | 2021 | 11,040 | | 2020 | 10,837 | | 2019 | 10,749 | | 2018 | 10,904 | | 2017 | 11,170 | | 2016 | 11,427 | | 2015 | 11,714 | | 2014 | 11,964 | | 2013 | 12,202 | | 2012 | 12,413 | | 2011 | 12,550 | | 2010 | 12,702 | | 2009 | 12,849 | | 2008 | 12,864 | | 2007 | 12,717 | | 2006 | 12,436 | | 2005 | 11,974 | | 2004 | 11,411 | | 2003 | 10,869 | | 2002 | 10,443 | | 2001 | 10,129 | | 2000 | 9,929 | | 1999 | 9,911 | | 1998 | 10,049 | | 1997 | 10,228 | | 1996 | 10,386 | | 1995 | 10,552 | | 1994 | 10,731 | | 1993 | 10,889 | | 1992 | 11,011 | | 1991 | 11,097 | | 1990 | 11,134 | | 1989 | 11,107 | | 1988 | 10,976 | | 1987 | 10,738 | | 1986 | 10,440 | | 1985 | 10,092 | | 1984 | 9,709 | | 1983 | 9,375 | | 1982 | 9,066 | | 1981 | 8,730 | | 1980 | 8,411 | | 1979 | 8,099 | | 1978 | 7,785 | | 1977 | 7,372 | | 1976 | 6,872 | | 1975 | 6,383 | | 1974 | 5,910 | | 1973 | 5,477 | | 1972 | 5,088 | | 1971 | 4,810 | | 1970 | 4,650 | | 1969 | 4,526 | | 1968 | 4,420 | | 1967 | 4,331 | | 1966 | 4,241 | | 1965 | 4,129 | | 1964 | 4,001 | | 1963 | 3,877 | | 1962 | 3,798 | | 1961 | 3,777 | | 1960 | 3,782 |
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