Year | Value | 2022 | 31,047 | 2021 | 29,743 | 2020 | 28,393 | 2019 | 27,705 | 2018 | 26,595 | 2017 | 25,368 | 2016 | 25,255 | 2015 | 25,386 | 2014 | 25,703 | 2013 | 26,123 | 2012 | 26,538 | 2011 | 27,028 | 2010 | 27,574 | 2009 | 27,995 | 2008 | 28,297 | 2007 | 28,521 | 2006 | 28,694 | 2005 | 28,839 | 2004 | 28,991 | 2003 | 29,161 | 2002 | 29,427 | 2001 | 29,754 | 2000 | 30,000 | 1999 | 30,152 | 1998 | 30,220 | 1997 | 30,220 | 1996 | 30,171 | 1995 | 30,081 | 1994 | 29,945 | 1993 | 29,745 | 1992 | 29,476 | 1991 | 29,072 | 1990 | 28,710 | 1989 | 28,410 | 1988 | 27,980 | 1987 | 27,478 | 1986 | 26,936 | 1985 | 26,322 | 1984 | 25,611 | 1983 | 24,790 | 1982 | 23,867 | 1981 | 22,883 | 1980 | 21,942 | 1979 | 21,073 | 1978 | 20,267 | 1977 | 19,569 | 1976 | 18,994 | 1975 | 18,556 | 1974 | 18,241 | 1973 | 18,017 | 1972 | 17,855 | 1971 | 17,736 | 1970 | 17,691 | 1969 | 17,710 | 1968 | 17,731 | 1967 | 17,733 | 1966 | 17,695 | 1965 | 17,593 | 1964 | 17,416 | 1963 | 17,178 | 1962 | 16,910 | 1961 | 16,633 | 1960 | 16,396 |
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