| Year | Value | | 2022 | 32,076 | | 2021 | 30,421 | | 2020 | 29,138 | | 2019 | 28,124 | | 2018 | 27,227 | | 2017 | 26,437 | | 2016 | 25,549 | | 2015 | 24,366 | | 2014 | 22,800 | | 2013 | 20,929 | | 2012 | 18,948 | | 2011 | 17,082 | | 2010 | 15,716 | | 2009 | 14,962 | | 2008 | 14,553 | | 2007 | 14,285 | | 2006 | 13,994 | | 2005 | 13,593 | | 2004 | 13,089 | | 2003 | 12,446 | | 2002 | 11,706 | | 2001 | 11,005 | | 2000 | 10,363 | | 1999 | 9,671 | | 1998 | 9,050 | | 1997 | 8,604 | | 1996 | 8,206 | | 1995 | 7,841 | | 1994 | 7,517 | | 1993 | 7,251 | | 1992 | 7,036 | | 1991 | 6,847 | | 1990 | 6,674 | | 1989 | 6,511 | | 1988 | 6,354 | | 1987 | 6,193 | | 1986 | 6,015 | | 1985 | 5,812 | | 1984 | 5,582 | | 1983 | 5,326 | | 1982 | 5,044 | | 1981 | 4,776 | | 1980 | 4,581 | | 1979 | 4,490 | | 1978 | 4,488 | | 1977 | 4,540 | | 1976 | 4,674 | | 1975 | 4,861 | | 1974 | 5,048 | | 1973 | 5,249 | | 1972 | 5,456 | | 1971 | 5,649 | | 1970 | 5,806 | | 1969 | 5,898 | | 1968 | 5,864 | | 1967 | 5,743 | | 1966 | 5,621 | | 1965 | 5,509 | | 1964 | 5,408 | | 1963 | 5,318 | | 1962 | 5,237 | | 1961 | 5,161 | | 1960 | 5,090 |
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