| Year | Value | | 2022 | 13,970 | | 2021 | 13,680 | | 2020 | 13,259 | | 2019 | 12,802 | | 2018 | 12,187 | | 2017 | 11,525 | | 2016 | 11,080 | | 2015 | 10,714 | | 2014 | 10,423 | | 2013 | 10,194 | | 2012 | 9,962 | | 2011 | 9,676 | | 2010 | 9,324 | | 2009 | 8,900 | | 2008 | 8,438 | | 2007 | 7,985 | | 2006 | 7,602 | | 2005 | 7,325 | | 2004 | 7,157 | | 2003 | 7,069 | | 2002 | 7,035 | | 2001 | 7,022 | | 2000 | 6,988 | | 1999 | 6,924 | | 1998 | 6,843 | | 1997 | 6,766 | | 1996 | 6,707 | | 1995 | 6,672 | | 1994 | 6,669 | | 1993 | 6,696 | | 1992 | 6,753 | | 1991 | 6,856 | | 1990 | 7,054 | | 1989 | 7,298 | | 1988 | 7,507 | | 1987 | 7,664 | | 1986 | 7,749 | | 1985 | 7,746 | | 1984 | 7,655 | | 1983 | 7,496 | | 1982 | 7,303 | | 1981 | 7,125 | | 1980 | 7,029 | | 1979 | 7,045 | | 1978 | 7,147 | | 1977 | 7,292 | | 1976 | 7,428 | | 1975 | 7,505 | | 1974 | 7,480 | | 1973 | 7,358 | | 1972 | 7,181 | | 1971 | 6,992 | | 1970 | 6,813 | | 1969 | 6,679 | | 1968 | 6,614 | | 1967 | 6,593 | | 1966 | 6,579 | | 1965 | 6,539 | | 1964 | 6,448 | | 1963 | 6,297 | | 1962 | 6,102 | | 1961 | 5,884 | | 1960 | 5,636 |
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