| Year | Value | | 2022 | 30,156 | | 2021 | 29,280 | | 2020 | 28,467 | | 2019 | 27,635 | | 2018 | 26,794 | | 2017 | 26,075 | | 2016 | 25,454 | | 2015 | 24,872 | | 2014 | 24,319 | | 2013 | 23,774 | | 2012 | 23,382 | | 2011 | 23,030 | | 2010 | 22,544 | | 2009 | 22,053 | | 2008 | 21,552 | | 2007 | 21,030 | | 2006 | 20,473 | | 2005 | 19,907 | | 2004 | 19,348 | | 2003 | 18,811 | | 2002 | 18,300 | | 2001 | 17,806 | | 2000 | 17,308 | | 1999 | 16,783 | | 1998 | 16,236 | | 1997 | 15,709 | | 1996 | 15,246 | | 1995 | 14,783 | | 1994 | 14,263 | | 1993 | 13,681 | | 1992 | 13,083 | | 1991 | 12,494 | | 1990 | 11,888 | | 1989 | 11,302 | | 1988 | 10,744 | | 1987 | 10,202 | | 1986 | 9,684 | | 1985 | 9,170 | | 1984 | 8,630 | | 1983 | 8,062 | | 1982 | 7,471 | | 1981 | 6,884 | | 1980 | 6,335 | | 1979 | 5,834 | | 1978 | 5,404 | | 1977 | 5,046 | | 1976 | 4,730 | | 1975 | 4,439 | | 1974 | 4,176 | | 1973 | 3,947 | | 1972 | 3,751 | | 1971 | 3,595 | | 1970 | 3,477 | | 1969 | 3,379 | | 1968 | 3,298 | | 1967 | 3,238 | | 1966 | 3,190 | | 1965 | 3,146 | | 1964 | 3,107 | | 1963 | 3,073 | | 1962 | 3,040 | | 1961 | 3,012 | | 1960 | 2,994 |
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