Year | Value | 2022 | 24,711 | 2021 | 24,494 | 2020 | 24,313 | 2019 | 24,251 | 2018 | 24,322 | 2017 | 24,424 | 2016 | 24,547 | 2015 | 24,700 | 2014 | 24,874 | 2013 | 25,040 | 2012 | 25,193 | 2011 | 25,227 | 2010 | 25,116 | 2009 | 25,002 | 2008 | 24,895 | 2007 | 24,769 | 2006 | 24,619 | 2005 | 24,459 | 2004 | 24,292 | 2003 | 24,117 | 2002 | 23,947 | 2001 | 23,781 | 2000 | 23,611 | 1999 | 23,440 | 1998 | 23,263 | 1997 | 23,078 | 1996 | 22,942 | 1995 | 22,859 | 1994 | 22,771 | 1993 | 22,684 | 1992 | 22,600 | 1991 | 22,511 | 1990 | 22,415 | 1989 | 22,304 | 1988 | 22,174 | 1987 | 22,019 | 1986 | 21,839 | 1985 | 21,612 | 1984 | 21,386 | 1983 | 21,158 | 1982 | 20,931 | 1981 | 20,699 | 1980 | 20,458 | 1979 | 20,204 | 1978 | 19,937 | 1977 | 19,652 | 1976 | 19,333 | 1975 | 19,010 | 1974 | 18,684 | 1973 | 18,373 | 1972 | 18,076 | 1971 | 17,772 | 1970 | 17,459 | 1969 | 17,133 | 1968 | 16,792 | 1967 | 16,424 | 1966 | 15,885 | 1965 | 15,148 | 1964 | 14,427 | 1963 | 13,734 | 1962 | 13,073 | 1961 | 12,441 | 1960 | 11,835 |
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