| Year | Value | | 2022 | 11,650 | | 2021 | 11,303 | | 2020 | 10,996 | | 2019 | 10,542 | | 2018 | 10,073 | | 2017 | 9,670 | | 2016 | 9,152 | | 2015 | 8,786 | | 2014 | 8,623 | | 2013 | 8,386 | | 2012 | 8,148 | | 2011 | 8,052 | | 2010 | 7,982 | | 2009 | 7,821 | | 2008 | 7,674 | | 2007 | 7,594 | | 2006 | 7,571 | | 2005 | 7,684 | | 2004 | 7,832 | | 2003 | 7,940 | | 2002 | 8,024 | | 2001 | 7,894 | | 2000 | 7,593 | | 1999 | 7,147 | | 1998 | 6,610 | | 1997 | 6,109 | | 1996 | 5,683 | | 1995 | 5,440 | | 1994 | 5,317 | | 1993 | 5,123 | | 1992 | 4,912 | | 1991 | 4,771 | | 1990 | 4,665 | | 1989 | 4,754 | | 1988 | 5,037 | | 1987 | 5,383 | | 1986 | 5,652 | | 1985 | 5,819 | | 1984 | 5,893 | | 1983 | 5,920 | | 1982 | 5,968 | | 1981 | 5,997 | | 1980 | 5,988 | | 1979 | 5,954 | | 1978 | 5,879 | | 1977 | 5,774 | | 1976 | 5,729 | | 1975 | 5,703 | | 1974 | 5,613 | | 1973 | 5,504 | | 1972 | 5,417 | | 1971 | 5,245 | | 1970 | 5,030 | | 1969 | 4,884 | | 1968 | 4,784 | | 1967 | 4,720 | | 1966 | 4,664 | | 1965 | 4,586 | | 1964 | 4,468 | | 1963 | 4,358 | | 1962 | 4,287 | | 1961 | 4,235 | | 1960 | 4,207 |
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