Year | Value | 2022 | 39,109 | 2021 | 38,897 | 2020 | 38,746 | 2019 | 38,492 | 2018 | 38,372 | 2017 | 38,207 | 2016 | 38,027 | 2015 | 37,857 | 2014 | 37,719 | 2013 | 37,612 | 2012 | 37,510 | 2011 | 37,382 | 2010 | 37,204 | 2009 | 36,966 | 2008 | 36,682 | 2007 | 36,358 | 2006 | 35,981 | 2005 | 35,545 | 2004 | 35,048 | 2003 | 34,477 | 2002 | 33,811 | 2001 | 33,044 | 2000 | 32,182 | 1999 | 31,232 | 1998 | 30,181 | 1997 | 29,139 | 1996 | 28,309 | 1995 | 27,796 | 1994 | 27,598 | 1993 | 27,746 | 1992 | 28,114 | 1991 | 28,385 | 1990 | 28,377 | 1989 | 28,099 | 1988 | 27,546 | 1987 | 26,781 | 1986 | 26,045 | 1985 | 25,467 | 1984 | 25,018 | 1983 | 24,689 | 1982 | 24,450 | 1981 | 24,157 | 1980 | 23,750 | 1979 | 23,262 | 1978 | 22,692 | 1977 | 22,070 | 1976 | 21,486 | 1975 | 20,989 | 1974 | 20,556 | 1973 | 20,170 | 1972 | 19,833 | 1971 | 19,508 | 1970 | 19,176 | 1969 | 18,849 | 1968 | 18,540 | 1967 | 18,248 | 1966 | 17,980 | 1965 | 17,739 | 1964 | 17,531 | 1963 | 17,363 | 1962 | 17,227 | 1961 | 17,115 | 1960 | 17,021 |
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