| Year | Value | | 2022 | 9,253 | | 2021 | 9,198 | | 2020 | 9,201 | | 2019 | 9,261 | | 2018 | 9,369 | | 2017 | 9,468 | | 2016 | 9,523 | | 2015 | 9,594 | | 2014 | 9,643 | | 2013 | 9,582 | | 2012 | 9,497 | | 2011 | 9,416 | | 2010 | 9,275 | | 2009 | 9,130 | | 2008 | 8,993 | | 2007 | 8,777 | | 2006 | 8,470 | | 2005 | 8,136 | | 2004 | 7,827 | | 2003 | 7,562 | | 2002 | 7,340 | | 2001 | 7,150 | | 2000 | 6,905 | | 1999 | 6,548 | | 1998 | 6,166 | | 1997 | 5,761 | | 1996 | 5,329 | | 1995 | 4,984 | | 1994 | 4,756 | | 1993 | 4,610 | | 1992 | 4,535 | | 1991 | 4,484 | | 1990 | 4,415 | | 1989 | 4,354 | | 1988 | 4,341 | | 1987 | 4,403 | | 1986 | 4,538 | | 1985 | 4,703 | | 1984 | 4,843 | | 1983 | 4,923 | | 1982 | 4,925 | | 1981 | 4,869 | | 1980 | 4,795 | | 1979 | 4,711 | | 1978 | 4,622 | | 1977 | 4,568 | | 1976 | 4,594 | | 1975 | 4,712 | | 1974 | 4,918 | | 1973 | 5,224 | | 1972 | 5,579 | | 1971 | 5,874 | | 1970 | 6,035 | | 1969 | 6,072 | | 1968 | 5,997 | | 1967 | 5,830 | | 1966 | 5,648 | | 1965 | 5,491 | | 1964 | 5,350 | | 1963 | 5,214 | | 1962 | 5,085 | | 1961 | 4,955 | | 1960 | 4,828 |
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