| Year | Value | | 2022 | 2,941 | | 2021 | 2,966 | | 2020 | 3,006 | | 2019 | 3,093 | | 2018 | 3,162 | | 2017 | 3,166 | | 2016 | 3,116 | | 2015 | 3,029 | | 2014 | 2,923 | | 2013 | 2,823 | | 2012 | 2,740 | | 2011 | 2,674 | | 2010 | 2,631 | | 2009 | 2,638 | | 2008 | 2,664 | | 2007 | 2,653 | | 2006 | 2,611 | | 2005 | 2,572 | | 2004 | 2,584 | | 2003 | 2,671 | | 2002 | 2,812 | | 2001 | 2,960 | | 2000 | 3,082 | | 1999 | 3,136 | | 1998 | 3,079 | | 1997 | 2,935 | | 1996 | 2,755 | | 1995 | 2,578 | | 1994 | 2,478 | | 1993 | 2,449 | | 1992 | 2,450 | | 1991 | 2,590 | | 1990 | 2,824 | | 1989 | 2,992 | | 1988 | 3,081 | | 1987 | 3,112 | | 1986 | 3,088 | | 1985 | 3,008 | | 1984 | 2,910 | | 1983 | 2,831 | | 1982 | 2,757 | | 1981 | 2,692 | | 1980 | 2,671 | | 1979 | 2,643 | | 1978 | 2,542 | | 1977 | 2,399 | | 1976 | 2,251 | | 1975 | 2,129 | | 1974 | 2,044 | | 1973 | 1,981 | | 1972 | 1,952 | | 1971 | 1,981 | | 1970 | 2,029 | | 1969 | 2,047 | | 1968 | 2,039 | | 1967 | 2,015 | | 1966 | 1,994 | | 1965 | 1,964 | | 1964 | 1,915 | | 1963 | 1,868 | | 1962 | 1,828 | | 1961 | 1,794 | | 1960 | 1,762 |
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