| Year | Value | | 2022 | 20,194 | | 2021 | 19,372 | | 2020 | 18,583 | | 2019 | 17,812 | | 2018 | 17,061 | | 2017 | 16,341 | | 2016 | 15,657 | | 2015 | 15,011 | | 2014 | 14,389 | | 2013 | 13,796 | | 2012 | 13,251 | | 2011 | 12,773 | | 2010 | 12,410 | | 2009 | 12,190 | | 2008 | 12,065 | | 2007 | 11,958 | | 2006 | 11,806 | | 2005 | 11,579 | | 2004 | 11,260 | | 2003 | 10,877 | | 2002 | 10,465 | | 2001 | 10,038 | | 2000 | 9,636 | | 1999 | 9,264 | | 1998 | 8,907 | | 1997 | 8,551 | | 1996 | 8,236 | | 1995 | 7,999 | | 1994 | 7,873 | | 1993 | 7,674 | | 1992 | 7,777 | | 1991 | 7,801 | | 1990 | 7,137 | | 1989 | 6,421 | | 1988 | 5,924 | | 1987 | 5,535 | | 1986 | 5,173 | | 1985 | 4,869 | | 1984 | 4,627 | | 1983 | 4,438 | | 1982 | 4,273 | | 1981 | 4,095 | | 1980 | 3,881 | | 1979 | 3,619 | | 1978 | 3,321 | | 1977 | 3,011 | | 1976 | 2,721 | | 1975 | 2,469 | | 1974 | 2,259 | | 1973 | 2,087 | | 1972 | 1,938 | | 1971 | 1,805 | | 1970 | 1,687 | | 1969 | 1,580 | | 1968 | 1,489 | | 1967 | 1,414 | | 1966 | 1,339 | | 1965 | 1,263 | | 1964 | 1,189 | | 1963 | 1,122 | | 1962 | 1,061 | | 1961 | 1,010 | | 1960 | 968 |
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