| Year | Value | | 2022 | 11,768 | | 2021 | 11,703 | | 2020 | 11,673 | | 2019 | 11,496 | | 2018 | 11,163 | | 2017 | 10,833 | | 2016 | 10,520 | | 2015 | 10,233 | | 2014 | 9,966 | | 2013 | 9,704 | | 2012 | 9,453 | | 2011 | 9,217 | | 2010 | 8,999 | | 2009 | 8,791 | | 2008 | 8,608 | | 2007 | 8,462 | | 2006 | 8,344 | | 2005 | 8,229 | | 2004 | 8,083 | | 2003 | 7,895 | | 2002 | 7,668 | | 2001 | 7,329 | | 2000 | 7,002 | | 1999 | 6,948 | | 1998 | 7,039 | | 1997 | 7,083 | | 1996 | 7,089 | | 1995 | 7,152 | | 1994 | 7,242 | | 1993 | 7,300 | | 1992 | 7,389 | | 1991 | 7,597 | | 1990 | 7,567 | | 1989 | 7,322 | | 1988 | 7,180 | | 1987 | 7,017 | | 1986 | 6,853 | | 1985 | 6,708 | | 1984 | 6,575 | | 1983 | 6,440 | | 1982 | 6,306 | | 1981 | 6,172 | | 1980 | 6,038 | | 1979 | 5,904 | | 1978 | 5,767 | | 1977 | 5,628 | | 1976 | 5,486 | | 1975 | 5,343 | | 1974 | 5,196 | | 1973 | 5,045 | | 1972 | 4,895 | | 1971 | 4,743 | | 1970 | 4,589 | | 1969 | 4,437 | | 1968 | 4,281 | | 1967 | 4,117 | | 1966 | 3,950 | | 1965 | 3,784 | | 1964 | 3,616 | | 1963 | 3,442 | | 1962 | 3,264 | | 1961 | 3,086 | | 1960 | 2,907 |
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