| Year | Value | | 2022 | 4,296 | | 2021 | 4,437 | | 2020 | 4,618 | | 2019 | 4,776 | | 2018 | 5,049 | | 2017 | 5,371 | | 2016 | 5,474 | | 2015 | 5,488 | | 2014 | 5,439 | | 2013 | 5,354 | | 2012 | 5,256 | | 2011 | 5,137 | | 2010 | 4,972 | | 2009 | 4,826 | | 2008 | 4,699 | | 2007 | 4,538 | | 2006 | 4,341 | | 2005 | 4,112 | | 2004 | 3,897 | | 2003 | 3,739 | | 2002 | 3,585 | | 2001 | 3,517 | | 2000 | 3,584 | | 1999 | 3,659 | | 1998 | 3,704 | | 1997 | 3,661 | | 1996 | 3,525 | | 1995 | 3,379 | | 1994 | 3,261 | | 1993 | 3,166 | | 1992 | 3,087 | | 1991 | 3,050 | | 1990 | 3,047 | | 1989 | 3,065 | | 1988 | 3,103 | | 1987 | 3,126 | | 1986 | 3,105 | | 1985 | 3,044 | | 1984 | 2,958 | | 1983 | 2,868 | | 1982 | 2,776 | | 1981 | 2,690 | | 1980 | 2,634 | | 1979 | 2,591 | | 1978 | 2,562 | | 1977 | 2,549 | | 1976 | 2,524 | | 1975 | 2,500 | | 1974 | 2,467 | | 1973 | 2,416 | | 1972 | 2,417 | | 1971 | 2,419 | | 1970 | 2,391 | | 1969 | 2,382 | | 1968 | 2,381 | | 1967 | 2,399 | | 1966 | 2,446 | | 1965 | 2,510 | | 1964 | 2,576 | | 1963 | 2,648 | | 1962 | 2,710 | | 1961 | 2,751 | | 1960 | 2,784 |
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