| Year | Value | | 2022 | 11,533 | | 2021 | 11,164 | | 2020 | 11,170 | | 2019 | 11,201 | | 2018 | 11,113 | | 2017 | 11,015 | | 2016 | 10,828 | | 2015 | 10,687 | | 2014 | 10,722 | | 2013 | 10,728 | | 2012 | 10,710 | | 2011 | 10,786 | | 2010 | 10,769 | | 2009 | 10,699 | | 2008 | 10,714 | | 2007 | 10,563 | | 2006 | 10,028 | | 2005 | 9,523 | | 2004 | 9,239 | | 2003 | 8,937 | | 2002 | 8,683 | | 2001 | 8,504 | | 2000 | 8,244 | | 1999 | 7,911 | | 1998 | 7,590 | | 1997 | 7,242 | | 1996 | 6,829 | | 1995 | 6,361 | | 1994 | 5,931 | | 1993 | 5,600 | | 1992 | 5,359 | | 1991 | 5,202 | | 1990 | 5,138 | | 1989 | 5,139 | | 1988 | 5,152 | | 1987 | 5,180 | | 1986 | 5,285 | | 1985 | 5,456 | | 1984 | 5,574 | | 1983 | 5,646 | | 1982 | 5,671 | | 1981 | 5,594 | | 1980 | 5,482 | | 1979 | 5,384 | | 1978 | 5,302 | | 1977 | 5,208 | | 1976 | 5,164 | | 1975 | 5,153 | | 1974 | 5,070 | | 1973 | 4,947 | | 1972 | 4,846 | | 1971 | 4,737 | | 1970 | 4,607 | | 1969 | 4,528 | | 1968 | 4,483 | | 1967 | 4,422 | | 1966 | 4,350 | | 1965 | 4,282 | | 1964 | 4,231 | | 1963 | 4,173 | | 1962 | 4,086 | | 1961 | 4,048 | | 1960 | 4,042 |
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