| Year | Value | | 2022 | 5,766 | | 2021 | 5,901 | | 2020 | 5,972 | | 2019 | 5,984 | | 2018 | 5,949 | | 2017 | 5,884 | | 2016 | 5,806 | | 2015 | 5,731 | | 2014 | 5,675 | | 2013 | 5,631 | | 2012 | 5,584 | | 2011 | 5,530 | | 2010 | 5,457 | | 2009 | 5,349 | | 2008 | 5,205 | | 2007 | 5,034 | | 2006 | 4,843 | | 2005 | 4,633 | | 2004 | 4,431 | | 2003 | 4,226 | | 2002 | 4,015 | | 2001 | 3,821 | | 2000 | 3,645 | | 1999 | 3,479 | | 1998 | 3,351 | | 1997 | 3,275 | | 1996 | 3,240 | | 1995 | 3,263 | | 1994 | 3,346 | | 1993 | 3,469 | | 1992 | 3,608 | | 1991 | 3,730 | | 1990 | 3,809 | | 1989 | 3,833 | | 1988 | 3,797 | | 1987 | 3,709 | | 1986 | 3,591 | | 1985 | 3,463 | | 1984 | 3,341 | | 1983 | 3,224 | | 1982 | 3,109 | | 1981 | 2,993 | | 1980 | 2,884 | | 1979 | 2,779 | | 1978 | 2,712 | | 1977 | 2,702 | | 1976 | 2,721 | | 1975 | 2,747 | | 1974 | 2,751 | | 1973 | 2,688 | | 1972 | 2,569 | | 1971 | 2,446 | | 1970 | 2,338 | | 1969 | 2,254 | | 1968 | 2,207 | | 1967 | 2,185 | | 1966 | 2,166 | | 1965 | 2,121 | | 1964 | 2,052 | | 1963 | 1,990 | | 1962 | 1,932 | | 1961 | 1,882 | | 1960 | 1,838 |
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