| Year | Value | | 2022 | 7,595 | | 2021 | 7,435 | | 2020 | 7,274 | | 2019 | 7,180 | | 2018 | 7,202 | | 2017 | 7,240 | | 2016 | 7,291 | | 2015 | 7,374 | | 2014 | 7,502 | | 2013 | 7,650 | | 2012 | 7,784 | | 2011 | 7,829 | | 2010 | 7,766 | | 2009 | 7,635 | | 2008 | 7,447 | | 2007 | 7,227 | | 2006 | 6,978 | | 2005 | 6,688 | | 2004 | 6,358 | | 2003 | 6,003 | | 2002 | 5,631 | | 2001 | 5,312 | | 2000 | 5,065 | | 1999 | 4,897 | | 1998 | 4,831 | | 1997 | 4,830 | | 1996 | 4,870 | | 1995 | 4,940 | | 1994 | 4,917 | | 1993 | 4,768 | | 1992 | 4,590 | | 1991 | 4,393 | | 1990 | 4,189 | | 1989 | 3,989 | | 1988 | 3,795 | | 1987 | 3,617 | | 1986 | 3,469 | | 1985 | 3,359 | | 1984 | 3,283 | | 1983 | 3,232 | | 1982 | 3,185 | | 1981 | 3,171 | | 1980 | 3,162 | | 1979 | 3,090 | | 1978 | 2,971 | | 1977 | 2,839 | | 1976 | 2,721 | | 1975 | 2,624 | | 1974 | 2,550 | | 1973 | 2,495 | | 1972 | 2,456 | | 1971 | 2,424 | | 1970 | 2,400 | | 1969 | 2,416 | | 1968 | 2,564 | | 1967 | 2,894 | | 1966 | 3,352 | | 1965 | 3,845 | | 1964 | 4,290 | | 1963 | 4,643 | | 1962 | 4,900 | | 1961 | 5,088 | | 1960 | 4,926 |
|