| Year | Value | | 2022 | 7,412 | | 2021 | 7,420 | | 2020 | 7,432 | | 2019 | 7,454 | | 2018 | 7,491 | | 2017 | 7,548 | | 2016 | 7,629 | | 2015 | 7,732 | | 2014 | 7,896 | | 2013 | 8,176 | | 2012 | 8,472 | | 2011 | 8,672 | | 2010 | 8,829 | | 2009 | 8,923 | | 2008 | 8,889 | | 2007 | 8,853 | | 2006 | 8,910 | | 2005 | 8,985 | | 2004 | 9,063 | | 2003 | 9,132 | | 2002 | 9,153 | | 2001 | 9,152 | | 2000 | 9,156 | | 1999 | 9,147 | | 1998 | 9,188 | | 1997 | 9,338 | | 1996 | 9,528 | | 1995 | 9,695 | | 1994 | 9,785 | | 1993 | 9,773 | | 1992 | 9,726 | | 1991 | 9,724 | | 1990 | 9,808 | | 1989 | 9,998 | | 1988 | 10,248 | | 1987 | 10,464 | | 1986 | 10,613 | | 1985 | 10,710 | | 1984 | 10,777 | | 1983 | 10,853 | | 1982 | 10,942 | | 1981 | 11,027 | | 1980 | 11,104 | | 1979 | 11,131 | | 1978 | 11,126 | | 1977 | 11,165 | | 1976 | 11,247 | | 1975 | 11,361 | | 1974 | 11,517 | | 1973 | 11,734 | | 1972 | 12,030 | | 1971 | 12,412 | | 1970 | 12,879 | | 1969 | 13,414 | | 1968 | 13,987 | | 1967 | 14,573 | | 1966 | 15,146 | | 1965 | 15,662 | | 1964 | 16,059 | | 1963 | 16,310 | | 1962 | 16,416 | | 1961 | 16,381 | | 1960 | 16,303 |
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