| Year | Value | | 2022 | 33,650 | | 2021 | 33,030 | | 2020 | 32,322 | | 2019 | 31,510 | | 2018 | 30,549 | | 2017 | 29,420 | | 2016 | 28,186 | | 2015 | 26,953 | | 2014 | 25,811 | | 2013 | 24,804 | | 2012 | 23,946 | | 2011 | 23,194 | | 2010 | 22,474 | | 2009 | 21,721 | | 2008 | 20,875 | | 2007 | 19,916 | | 2006 | 18,881 | | 2005 | 17,843 | | 2004 | 16,869 | | 2003 | 16,178 | | 2002 | 16,193 | | 2001 | 16,620 | | 2000 | 16,859 | | 1999 | 16,814 | | 1998 | 16,433 | | 1997 | 15,902 | | 1996 | 15,423 | | 1995 | 15,001 | | 1994 | 14,637 | | 1993 | 14,319 | | 1992 | 14,022 | | 1991 | 13,667 | | 1990 | 13,264 | | 1989 | 12,876 | | 1988 | 12,518 | | 1987 | 12,190 | | 1986 | 11,882 | | 1985 | 11,588 | | 1984 | 11,292 | | 1983 | 10,980 | | 1982 | 10,646 | | 1981 | 10,257 | | 1980 | 9,801 | | 1979 | 9,248 | | 1978 | 8,638 | | 1977 | 8,117 | | 1976 | 7,743 | | 1975 | 7,490 | | 1974 | 7,393 | | 1973 | 7,445 | | 1972 | 7,529 | | 1971 | 7,603 | | 1970 | 7,677 | | 1969 | 7,751 | | 1968 | 7,824 | | 1967 | 7,894 | | 1966 | 7,918 | | 1965 | 7,876 | | 1964 | 7,786 | | 1963 | 7,650 | | 1962 | 7,481 | | 1961 | 7,294 | | 1960 | 7,110 |
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