Year | Value | 2022 | 26,865 | 2021 | 26,419 | 2020 | 25,803 | 2019 | 25,085 | 2018 | 24,397 | 2017 | 23,901 | 2016 | 23,623 | 2015 | 23,525 | 2014 | 23,499 | 2013 | 23,490 | 2012 | 23,510 | 2011 | 23,584 | 2010 | 23,739 | 2009 | 24,033 | 2008 | 24,446 | 2007 | 24,820 | 2006 | 24,988 | 2005 | 24,868 | 2004 | 24,422 | 2003 | 23,514 | 2002 | 22,361 | 2001 | 21,393 | 2000 | 20,724 | 1999 | 20,510 | 1998 | 20,673 | 1997 | 20,901 | 1996 | 21,050 | 1995 | 21,087 | 1994 | 21,171 | 1993 | 21,452 | 1992 | 21,792 | 1991 | 22,128 | 1990 | 22,539 | 1989 | 22,937 | 1988 | 23,227 | 1987 | 23,471 | 1986 | 23,539 | 1985 | 23,213 | 1984 | 22,510 | 1983 | 21,518 | 1982 | 20,327 | 1981 | 19,054 | 1980 | 17,836 | 1979 | 17,256 | 1978 | 17,314 | 1977 | 17,413 | 1976 | 17,406 | 1975 | 17,189 | 1974 | 16,733 | 1973 | 16,072 | 1972 | 15,293 | 1971 | 14,343 | 1970 | 13,391 | 1969 | 12,677 | 1968 | 12,151 | 1967 | 11,778 | 1966 | 11,539 | 1965 | 11,415 | 1964 | 11,369 | 1963 | 11,350 | 1962 | 11,313 | 1961 | 11,202 | 1960 | 11,033 |
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