| Year | Value | | 2022 | 10,163 | | 2021 | 10,135 | | 2020 | 10,224 | | 2019 | 10,428 | | 2018 | 10,670 | | 2017 | 10,842 | | 2016 | 10,962 | | 2015 | 11,057 | | 2014 | 11,077 | | 2013 | 10,987 | | 2012 | 10,872 | | 2011 | 10,753 | | 2010 | 10,580 | | 2009 | 10,365 | | 2008 | 10,152 | | 2007 | 9,895 | | 2006 | 9,510 | | 2005 | 9,090 | | 2004 | 8,737 | | 2003 | 8,431 | | 2002 | 8,126 | | 2001 | 7,833 | | 2000 | 7,506 | | 1999 | 7,115 | | 1998 | 6,729 | | 1997 | 6,363 | | 1996 | 6,019 | | 1995 | 5,741 | | 1994 | 5,526 | | 1993 | 5,378 | | 1992 | 5,313 | | 1991 | 5,293 | | 1990 | 5,287 | | 1989 | 5,259 | | 1988 | 5,207 | | 1987 | 5,175 | | 1986 | 5,194 | | 1985 | 5,271 | | 1984 | 5,378 | | 1983 | 5,492 | | 1982 | 5,586 | | 1981 | 5,631 | | 1980 | 5,618 | | 1979 | 5,565 | | 1978 | 5,486 | | 1977 | 5,395 | | 1976 | 5,334 | | 1975 | 5,323 | | 1974 | 5,356 | | 1973 | 5,436 | | 1972 | 5,555 | | 1971 | 5,692 | | 1970 | 5,819 | | 1969 | 5,936 | | 1968 | 6,060 | | 1967 | 6,171 | | 1966 | 6,233 | | 1965 | 6,232 | | 1964 | 6,166 | | 1963 | 6,021 | | 1962 | 5,830 | | 1961 | 5,690 | | 1960 | 5,657 |
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