Year | Value | 2022 | 17,215 | 2021 | 17,157 | 2020 | 17,062 | 2019 | 16,936 | 2018 | 17,006 | 2017 | 17,227 | 2016 | 17,518 | 2015 | 17,792 | 2014 | 18,005 | 2013 | 18,080 | 2012 | 18,012 | 2011 | 17,922 | 2010 | 17,935 | 2009 | 18,122 | 2008 | 18,504 | 2007 | 19,013 | 2006 | 19,486 | 2005 | 19,865 | 2004 | 20,201 | 2003 | 20,538 | 2002 | 20,863 | 2001 | 21,188 | 2000 | 21,525 | 1999 | 21,853 | 1998 | 22,185 | 1997 | 22,491 | 1996 | 22,713 | 1995 | 22,883 | 1994 | 22,996 | 1993 | 23,020 | 1992 | 23,007 | 1991 | 22,636 | 1990 | 21,917 | 1989 | 21,211 | 1988 | 20,615 | 1987 | 20,147 | 1986 | 19,697 | 1985 | 19,246 | 1984 | 18,818 | 1983 | 18,421 | 1982 | 17,861 | 1981 | 17,209 | 1980 | 16,676 | 1979 | 16,197 | 1978 | 15,762 | 1977 | 15,373 | 1976 | 14,955 | 1975 | 14,454 | 1974 | 13,888 | 1973 | 13,231 | 1972 | 12,450 | 1971 | 11,536 | 1970 | 10,891 | 1969 | 10,606 | 1968 | 10,357 | 1967 | 10,105 | 1966 | 9,789 | 1965 | 9,396 | 1964 | 8,931 | 1963 | 8,361 | 1962 | 7,691 | 1961 | 6,928 | 1960 | 6,056 |
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