| Year | Value | | 2022 | 14,305 | | 2021 | 13,782 | | 2020 | 13,789 | | 2019 | 13,828 | | 2018 | 13,787 | | 2017 | 13,957 | | 2016 | 14,240 | | 2015 | 14,375 | | 2014 | 14,258 | | 2013 | 14,039 | | 2012 | 13,335 | | 2011 | 11,999 | | 2010 | 10,647 | | 2009 | 9,478 | | 2008 | 8,414 | | 2007 | 7,869 | | 2006 | 7,979 | | 2005 | 8,220 | | 2004 | 8,282 | | 2003 | 8,116 | | 2002 | 7,859 | | 2001 | 7,611 | | 2000 | 7,319 | | 1999 | 7,054 | | 1998 | 6,875 | | 1997 | 6,709 | | 1996 | 6,570 | | 1995 | 6,499 | | 1994 | 6,471 | | 1993 | 6,476 | | 1992 | 6,495 | | 1991 | 6,482 | | 1990 | 6,328 | | 1989 | 6,230 | | 1988 | 6,058 | | 1987 | 5,837 | | 1986 | 5,593 | | 1985 | 5,302 | | 1984 | 5,056 | | 1983 | 4,984 | | 1982 | 4,942 | | 1981 | 4,941 | | 1980 | 5,064 | | 1979 | 5,209 | | 1978 | 5,361 | | 1977 | 5,495 | | 1976 | 5,626 | | 1975 | 5,700 | | 1974 | 5,686 | | 1973 | 5,643 | | 1972 | 5,547 | | 1971 | 5,405 | | 1970 | 5,229 | | 1969 | 5,075 | | 1968 | 4,952 | | 1967 | 4,832 | | 1966 | 4,735 | | 1965 | 4,677 | | 1964 | 4,635 | | 1963 | 4,598 | | 1962 | 4,587 | | 1961 | 4,576 | | 1960 | 4,550 |
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