| Year | Value | | 2022 | 10,407 | | 2021 | 10,019 | | 2020 | 9,750 | | 2019 | 9,692 | | 2018 | 9,813 | | 2017 | 9,978 | | 2016 | 10,144 | | 2015 | 10,337 | | 2014 | 10,520 | | 2013 | 10,675 | | 2012 | 10,828 | | 2011 | 10,962 | | 2010 | 11,051 | | 2009 | 11,098 | | 2008 | 11,090 | | 2007 | 10,980 | | 2006 | 10,755 | | 2005 | 10,438 | | 2004 | 10,073 | | 2003 | 9,691 | | 2002 | 9,318 | | 2001 | 8,957 | | 2000 | 8,600 | | 1999 | 8,238 | | 1998 | 7,866 | | 1997 | 7,489 | | 1996 | 7,126 | | 1995 | 6,801 | | 1994 | 6,533 | | 1993 | 6,328 | | 1992 | 6,176 | | 1991 | 6,071 | | 1990 | 6,002 | | 1989 | 5,931 | | 1988 | 5,833 | | 1987 | 5,717 | | 1986 | 5,577 | | 1985 | 5,413 | | 1984 | 5,246 | | 1983 | 5,082 | | 1982 | 4,908 | | 1981 | 4,737 | | 1980 | 4,581 | | 1979 | 4,431 | | 1978 | 4,277 | | 1977 | 4,109 | | 1976 | 3,926 | | 1975 | 3,731 | | 1974 | 3,530 | | 1973 | 3,338 | | 1972 | 3,160 | | 1971 | 2,997 | | 1970 | 2,856 | | 1969 | 2,737 | | 1968 | 2,625 | | 1967 | 2,510 | | 1966 | 2,381 | | 1965 | 2,241 | | 1964 | 2,099 | | 1963 | 1,980 | | 1962 | 1,903 | | 1961 | 1,877 | | 1960 | 1,894 |
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