| Year | Value | | 2022 | 8,619 | | 2021 | 8,588 | | 2020 | 8,542 | | 2019 | 8,491 | | 2018 | 8,442 | | 2017 | 8,407 | | 2016 | 8,386 | | 2015 | 8,353 | | 2014 | 8,278 | | 2013 | 8,151 | | 2012 | 7,964 | | 2011 | 7,714 | | 2010 | 7,459 | | 2009 | 7,227 | | 2008 | 7,000 | | 2007 | 6,819 | | 2006 | 6,721 | | 2005 | 6,657 | | 2004 | 6,617 | | 2003 | 6,630 | | 2002 | 6,655 | | 2001 | 6,640 | | 2000 | 6,614 | | 1999 | 6,606 | | 1998 | 6,590 | | 1997 | 6,570 | | 1996 | 6,551 | | 1995 | 6,534 | | 1994 | 6,510 | | 1993 | 6,470 | | 1992 | 6,405 | | 1991 | 6,309 | | 1990 | 6,207 | | 1989 | 6,094 | | 1988 | 5,953 | | 1987 | 5,797 | | 1986 | 5,629 | | 1985 | 5,453 | | 1984 | 5,296 | | 1983 | 5,145 | | 1982 | 4,979 | | 1981 | 4,824 | | 1980 | 4,678 | | 1979 | 4,543 | | 1978 | 4,471 | | 1977 | 4,475 | | 1976 | 4,521 | | 1975 | 4,614 | | 1974 | 4,749 | | 1973 | 4,876 | | 1972 | 4,960 | | 1971 | 5,010 | | 1970 | 5,029 | | 1969 | 5,032 | | 1968 | 5,021 | | 1967 | 4,969 | | 1966 | 4,866 | | 1965 | 4,749 | | 1964 | 4,639 | | 1963 | 4,523 | | 1962 | 4,399 | | 1961 | 4,268 | | 1960 | 4,141 |
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