| Year | Value | | 2022 | 15,379 | | 2021 | 14,854 | | 2020 | 14,417 | | 2019 | 14,034 | | 2018 | 13,722 | | 2017 | 13,501 | | 2016 | 13,355 | | 2015 | 13,279 | | 2014 | 13,267 | | 2013 | 13,277 | | 2012 | 13,267 | | 2011 | 13,212 | | 2010 | 13,093 | | 2009 | 12,934 | | 2008 | 12,746 | | 2007 | 12,511 | | 2006 | 12,238 | | 2005 | 11,927 | | 2004 | 11,577 | | 2003 | 11,199 | | 2002 | 10,795 | | 2001 | 10,381 | | 2000 | 9,969 | | 1999 | 9,590 | | 1998 | 9,194 | | 1997 | 8,759 | | 1996 | 8,370 | | 1995 | 8,057 | | 1994 | 7,803 | | 1993 | 7,655 | | 1992 | 7,617 | | 1991 | 7,595 | | 1990 | 7,554 | | 1989 | 7,497 | | 1988 | 7,429 | | 1987 | 7,359 | | 1986 | 7,277 | | 1985 | 7,176 | | 1984 | 7,063 | | 1983 | 6,937 | | 1982 | 6,798 | | 1981 | 6,654 | | 1980 | 6,505 | | 1979 | 6,231 | | 1978 | 5,897 | | 1977 | 5,659 | | 1976 | 5,459 | | 1975 | 5,269 | | 1974 | 5,087 | | 1973 | 4,908 | | 1972 | 4,732 | | 1971 | 4,559 | | 1970 | 4,387 | | 1969 | 4,221 | | 1968 | 4,064 | | 1967 | 3,910 | | 1966 | 3,759 | | 1965 | 3,625 | | 1964 | 3,506 | | 1963 | 3,399 | | 1962 | 3,309 | | 1961 | 3,236 | | 1960 | 3,167 |
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