Year | Value | 2022 | 31,345 | 2021 | 31,078 | 2020 | 30,451 | 2019 | 29,469 | 2018 | 28,308 | 2017 | 27,151 | 2016 | 26,067 | 2015 | 25,062 | 2014 | 24,119 | 2013 | 23,271 | 2012 | 22,525 | 2011 | 21,841 | 2010 | 21,198 | 2009 | 20,610 | 2008 | 20,076 | 2007 | 19,577 | 2006 | 19,146 | 2005 | 18,754 | 2004 | 18,387 | 2003 | 18,067 | 2002 | 17,767 | 2001 | 17,472 | 2000 | 17,186 | 1999 | 16,900 | 1998 | 16,613 | 1997 | 16,330 | 1996 | 16,070 | 1995 | 15,881 | 1994 | 15,800 | 1993 | 15,541 | 1992 | 15,216 | 1991 | 15,068 | 1990 | 14,916 | 1989 | 14,767 | 1988 | 14,623 | 1987 | 14,489 | 1986 | 14,359 | 1985 | 14,222 | 1984 | 14,083 | 1983 | 13,933 | 1982 | 13,752 | 1981 | 13,551 | 1980 | 13,327 | 1979 | 13,077 | 1978 | 12,791 | 1977 | 12,486 | 1976 | 12,208 | 1975 | 11,988 | 1974 | 11,833 | 1973 | 11,746 | 1972 | 11,709 | 1971 | 11,669 | 1970 | 11,598 | 1969 | 11,495 | 1968 | 11,359 | 1967 | 11,203 | 1966 | 11,081 | 1965 | 11,033 | 1964 | 11,056 | 1963 | 11,162 | 1962 | 11,348 | 1961 | 11,570 | 1960 | 11,800 |
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