| Year | Value | | 2022 | 9,649 | | 2021 | 9,508 | | 2020 | 9,368 | | 2019 | 9,108 | | 2018 | 8,779 | | 2017 | 8,477 | | 2016 | 8,205 | | 2015 | 7,924 | | 2014 | 7,666 | | 2013 | 7,460 | | 2012 | 7,297 | | 2011 | 6,863 | | 2010 | 6,345 | | 2009 | 6,065 | | 2008 | 5,758 | | 2007 | 5,419 | | 2006 | 5,084 | | 2005 | 4,737 | | 2004 | 4,463 | | 2003 | 4,353 | | 2002 | 4,257 | | 2001 | 4,080 | | 2000 | 3,900 | | 1999 | 3,701 | | 1998 | 3,444 | | 1997 | 3,054 | | 1996 | 2,773 | | 1995 | 2,648 | | 1994 | 2,575 | | 1993 | 2,528 | | 1992 | 2,361 | | 1991 | 2,153 | | 1990 | 2,372 | | 1989 | 2,601 | | 1988 | 2,412 | | 1987 | 2,231 | | 1986 | 2,054 | | 1985 | 1,880 | | 1984 | 1,702 | | 1983 | 1,735 | | 1982 | 1,811 | | 1981 | 1,756 | | 1980 | 1,770 | | 1979 | 1,840 | | 1978 | 1,954 | | 1977 | 2,100 | | 1976 | 2,277 | | 1975 | 2,486 | | 1974 | 2,542 | | 1973 | 2,432 | | 1972 | 2,326 | | 1971 | 2,225 | | 1970 | 2,128 | | 1969 | 2,042 | | 1968 | 1,964 | | 1967 | 1,886 | | 1966 | 1,802 | | 1965 | 1,711 | | 1964 | 1,604 | | 1963 | 1,480 | | 1962 | 1,391 | | 1961 | 1,347 | | 1960 | 1,306 |
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