| Year | Value | | 2022 | 7,338 | | 2021 | 7,540 | | 2020 | 7,759 | | 2019 | 7,999 | | 2018 | 8,229 | | 2017 | 8,400 | | 2016 | 8,477 | | 2015 | 8,445 | | 2014 | 8,313 | | 2013 | 8,121 | | 2012 | 7,906 | | 2011 | 7,689 | | 2010 | 7,483 | | 2009 | 7,406 | | 2008 | 7,474 | | 2007 | 7,570 | | 2006 | 7,641 | | 2005 | 7,638 | | 2004 | 7,554 | | 2003 | 7,411 | | 2002 | 7,248 | | 2001 | 7,152 | | 2000 | 7,184 | | 1999 | 7,253 | | 1998 | 7,260 | | 1997 | 7,205 | | 1996 | 7,097 | | 1995 | 6,949 | | 1994 | 6,796 | | 1993 | 6,674 | | 1992 | 6,591 | | 1991 | 6,571 | | 1990 | 6,598 | | 1989 | 6,633 | | 1988 | 6,638 | | 1987 | 6,572 | | 1986 | 6,454 | | 1985 | 6,321 | | 1984 | 6,192 | | 1983 | 6,055 | | 1982 | 5,896 | | 1981 | 5,706 | | 1980 | 5,474 | | 1979 | 5,217 | | 1978 | 4,970 | | 1977 | 4,741 | | 1976 | 4,535 | | 1975 | 4,345 | | 1974 | 4,160 | | 1973 | 3,975 | | 1972 | 3,789 | | 1971 | 3,600 | | 1970 | 3,411 | | 1969 | 3,289 | | 1968 | 3,247 | | 1967 | 3,225 | | 1966 | 3,215 | | 1965 | 3,215 | | 1964 | 3,223 | | 1963 | 3,236 | | 1962 | 3,253 | | 1961 | 3,272 | | 1960 | 3,283 |
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