| Year | Value | | 2022 | 9,802 | | 2021 | 9,892 | | 2020 | 9,914 | | 2019 | 9,867 | | 2018 | 9,791 | | 2017 | 9,704 | | 2016 | 9,626 | | 2015 | 9,627 | | 2014 | 9,755 | | 2013 | 9,878 | | 2012 | 9,976 | | 2011 | 9,984 | | 2010 | 9,876 | | 2009 | 9,735 | | 2008 | 9,600 | | 2007 | 9,419 | | 2006 | 9,225 | | 2005 | 8,991 | | 2004 | 8,784 | | 2003 | 8,636 | | 2002 | 8,444 | | 2001 | 8,224 | | 2000 | 8,002 | | 1999 | 7,783 | | 1998 | 7,567 | | 1997 | 7,345 | | 1996 | 7,087 | | 1995 | 6,807 | | 1994 | 6,517 | | 1993 | 6,237 | | 1992 | 6,019 | | 1991 | 5,856 | | 1990 | 5,729 | | 1989 | 5,608 | | 1988 | 5,526 | | 1987 | 5,492 | | 1986 | 5,437 | | 1985 | 5,341 | | 1984 | 5,219 | | 1983 | 5,061 | | 1982 | 4,877 | | 1981 | 4,705 | | 1980 | 4,580 | | 1979 | 4,518 | | 1978 | 4,490 | | 1977 | 4,450 | | 1976 | 4,393 | | 1975 | 4,342 | | 1974 | 4,280 | | 1973 | 4,187 | | 1972 | 4,086 | | 1971 | 3,915 | | 1970 | 3,670 | | 1969 | 3,420 | | 1968 | 3,286 | | 1967 | 3,215 | | 1966 | 3,146 | | 1965 | 3,072 | | 1964 | 3,015 | | 1963 | 2,951 | | 1962 | 2,881 | | 1961 | 2,811 | | 1960 | 2,746 |
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