| Year | Value | | 2022 | 7,772 | | 2021 | 7,559 | | 2020 | 7,362 | | 2019 | 7,252 | | 2018 | 7,269 | | 2017 | 7,305 | | 2016 | 7,359 | | 2015 | 7,444 | | 2014 | 7,557 | | 2013 | 7,680 | | 2012 | 7,793 | | 2011 | 7,820 | | 2010 | 7,752 | | 2009 | 7,628 | | 2008 | 7,449 | | 2007 | 7,215 | | 2006 | 6,936 | | 2005 | 6,623 | | 2004 | 6,278 | | 2003 | 5,921 | | 2002 | 5,581 | | 2001 | 5,306 | | 2000 | 5,111 | | 1999 | 4,992 | | 1998 | 4,941 | | 1997 | 4,924 | | 1996 | 4,925 | | 1995 | 4,939 | | 1994 | 4,891 | | 1993 | 4,756 | | 1992 | 4,594 | | 1991 | 4,416 | | 1990 | 4,229 | | 1989 | 4,043 | | 1988 | 3,867 | | 1987 | 3,705 | | 1986 | 3,565 | | 1985 | 3,458 | | 1984 | 3,379 | | 1983 | 3,312 | | 1982 | 3,242 | | 1981 | 3,196 | | 1980 | 3,152 | | 1979 | 3,058 | | 1978 | 2,932 | | 1977 | 2,801 | | 1976 | 2,685 | | 1975 | 2,586 | | 1974 | 2,505 | | 1973 | 2,438 | | 1972 | 2,383 | | 1971 | 2,335 | | 1970 | 2,273 | | 1969 | 2,194 | | 1968 | 2,163 | | 1967 | 2,227 | | 1966 | 2,365 | | 1965 | 2,543 | | 1964 | 2,722 | | 1963 | 2,871 | | 1962 | 2,976 | | 1961 | 3,037 | | 1960 | 2,920 |
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