| Year | Value | | 2022 | 22,020 | | 2021 | 21,538 | | 2020 | 21,019 | | 2019 | 20,502 | | 2018 | 19,986 | | 2017 | 19,451 | | 2016 | 18,899 | | 2015 | 18,334 | | 2014 | 17,782 | | 2013 | 17,259 | | 2012 | 16,763 | | 2011 | 16,310 | | 2010 | 15,907 | | 2009 | 15,480 | | 2008 | 14,980 | | 2007 | 14,437 | | 2006 | 13,851 | | 2005 | 13,228 | | 2004 | 12,629 | | 2003 | 12,099 | | 2002 | 11,608 | | 2001 | 11,138 | | 2000 | 10,680 | | 1999 | 10,230 | | 1998 | 9,797 | | 1997 | 9,375 | | 1996 | 8,941 | | 1995 | 8,520 | | 1994 | 8,152 | | 1993 | 7,828 | | 1992 | 7,550 | | 1991 | 7,345 | | 1990 | 7,179 | | 1989 | 7,020 | | 1988 | 6,852 | | 1987 | 6,661 | | 1986 | 6,452 | | 1985 | 6,246 | | 1984 | 6,035 | | 1983 | 5,811 | | 1982 | 5,589 | | 1981 | 5,373 | | 1980 | 5,167 | | 1979 | 4,980 | | 1978 | 4,815 | | 1977 | 4,664 | | 1976 | 4,522 | | 1975 | 4,407 | | 1974 | 4,329 | | 1973 | 4,272 | | 1972 | 4,233 | | 1971 | 4,207 | | 1970 | 4,150 | | 1969 | 4,053 | | 1968 | 3,951 | | 1967 | 3,853 | | 1966 | 3,758 | | 1965 | 3,668 | | 1964 | 3,580 | | 1963 | 3,491 | | 1962 | 3,404 | | 1961 | 3,317 | | 1960 | 3,225 |
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