Year | Value | 2022 | 36,748 | 2021 | 36,547 | 2020 | 36,458 | 2019 | 36,734 | 2018 | 37,247 | 2017 | 37,713 | 2016 | 38,153 | 2015 | 38,451 | 2014 | 38,468 | 2013 | 38,257 | 2012 | 37,825 | 2011 | 37,178 | 2010 | 36,308 | 2009 | 35,175 | 2008 | 33,937 | 2007 | 32,731 | 2006 | 31,686 | 2005 | 30,973 | 2004 | 30,660 | 2003 | 30,613 | 2002 | 30,584 | 2001 | 30,536 | 2000 | 30,512 | 1999 | 30,525 | 1998 | 30,607 | 1997 | 30,781 | 1996 | 30,878 | 1995 | 30,974 | 1994 | 31,150 | 1993 | 31,189 | 1992 | 31,034 | 1991 | 30,844 | 1990 | 30,466 | 1989 | 29,727 | 1988 | 28,783 | 1987 | 27,692 | 1986 | 26,476 | 1985 | 25,069 | 1984 | 23,794 | 1983 | 22,829 | 1982 | 21,965 | 1981 | 21,279 | 1980 | 20,781 | 1979 | 20,134 | 1978 | 19,368 | 1977 | 18,759 | 1976 | 18,248 | 1975 | 17,829 | 1974 | 17,521 | 1973 | 17,226 | 1972 | 16,890 | 1971 | 16,535 | 1970 | 16,178 | 1969 | 15,814 | 1968 | 15,432 | 1967 | 15,032 | 1966 | 14,610 | 1965 | 14,160 | 1964 | 13,688 | 1963 | 13,225 | 1962 | 12,780 | 1961 | 12,341 | 1960 | 11,909 |
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