Year | Value | 2022 | 24,570 | 2021 | 24,471 | 2020 | 24,369 | 2019 | 24,186 | 2018 | 23,828 | 2017 | 23,272 | 2016 | 22,564 | 2015 | 21,788 | 2014 | 21,035 | 2013 | 20,332 | 2012 | 19,650 | 2011 | 18,983 | 2010 | 18,534 | 2009 | 18,504 | 2008 | 18,613 | 2007 | 18,531 | 2006 | 18,218 | 2005 | 17,815 | 2004 | 17,571 | 2003 | 17,623 | 2002 | 17,848 | 2001 | 18,009 | 2000 | 17,929 | 1999 | 17,526 | 1998 | 16,826 | 1997 | 16,006 | 1996 | 15,277 | 1995 | 14,761 | 1994 | 14,481 | 1993 | 14,359 | 1992 | 14,252 | 1991 | 14,036 | 1990 | 13,759 | 1989 | 13,536 | 1988 | 13,378 | 1987 | 13,271 | 1986 | 13,206 | 1985 | 13,176 | 1984 | 13,165 | 1983 | 13,160 | 1982 | 13,153 | 1981 | 13,136 | 1980 | 12,982 | 1979 | 12,712 | 1978 | 12,524 | 1977 | 12,453 | 1976 | 12,458 | 1975 | 12,443 | 1974 | 12,302 | 1973 | 11,996 | 1972 | 11,602 | 1971 | 11,231 | 1970 | 10,941 | 1969 | 10,716 | 1968 | 10,551 | 1967 | 10,426 | 1966 | 10,268 | 1965 | 10,034 | 1964 | 9,738 | 1963 | 9,383 | 1962 | 8,981 | 1961 | 8,584 | 1960 | 8,226 |
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