| Year | Value | | 2022 | 34,551 | | 2021 | 34,097 | | 2020 | 33,582 | | 2019 | 32,969 | | 2018 | 32,259 | | 2017 | 31,468 | | 2016 | 30,601 | | 2015 | 29,665 | | 2014 | 28,672 | | 2013 | 27,639 | | 2012 | 26,583 | | 2011 | 25,528 | | 2010 | 24,490 | | 2009 | 23,470 | | 2008 | 22,480 | | 2007 | 21,541 | | 2006 | 20,631 | | 2005 | 19,839 | | 2004 | 19,197 | | 2003 | 18,606 | | 2002 | 17,888 | | 2001 | 17,007 | | 2000 | 16,162 | | 1999 | 15,367 | | 1998 | 14,543 | | 1997 | 13,677 | | 1996 | 13,022 | | 1995 | 12,743 | | 1994 | 12,834 | | 1993 | 12,900 | | 1992 | 13,529 | | 1991 | 13,951 | | 1990 | 12,965 | | 1989 | 11,711 | | 1988 | 10,760 | | 1987 | 10,003 | | 1986 | 9,314 | | 1985 | 8,740 | | 1984 | 8,292 | | 1983 | 7,953 | | 1982 | 7,665 | | 1981 | 7,355 | | 1980 | 6,975 | | 1979 | 6,514 | | 1978 | 5,985 | | 1977 | 5,435 | | 1976 | 4,924 | | 1975 | 4,483 | | 1974 | 4,114 | | 1973 | 3,812 | | 1972 | 3,554 | | 1971 | 3,318 | | 1970 | 3,105 | | 1969 | 2,910 | | 1968 | 2,743 | | 1967 | 2,599 | | 1966 | 2,462 | | 1965 | 2,331 | | 1964 | 2,205 | | 1963 | 2,089 | | 1962 | 1,988 | | 1961 | 1,901 | | 1960 | 1,822 |
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