Year | Value | 2022 | 22,753 | 2021 | 22,854 | 2020 | 22,642 | 2019 | 22,079 | 2018 | 21,255 | 2017 | 20,375 | 2016 | 19,614 | 2015 | 19,099 | 2014 | 18,942 | 2013 | 19,182 | 2012 | 19,643 | 2011 | 20,095 | 2010 | 20,402 | 2009 | 20,482 | 2008 | 20,347 | 2007 | 20,132 | 2006 | 19,974 | 2005 | 19,898 | 2004 | 19,867 | 2003 | 19,830 | 2002 | 19,737 | 2001 | 19,522 | 2000 | 19,124 | 1999 | 18,499 | 1998 | 17,615 | 1997 | 16,511 | 1996 | 15,273 | 1995 | 13,997 | 1994 | 12,896 | 1993 | 12,092 | 1992 | 11,450 | 1991 | 10,885 | 1990 | 10,392 | 1989 | 9,914 | 1988 | 9,438 | 1987 | 9,036 | 1986 | 8,703 | 1985 | 8,410 | 1984 | 8,185 | 1983 | 8,039 | 1982 | 7,965 | 1981 | 7,954 | 1980 | 7,998 | 1979 | 8,124 | 1978 | 8,302 | 1977 | 8,486 | 1976 | 8,678 | 1975 | 8,871 | 1974 | 9,057 | 1973 | 9,213 | 1972 | 9,316 | 1971 | 9,275 | 1970 | 9,080 | 1969 | 8,830 | 1968 | 8,582 | 1967 | 8,352 | 1966 | 8,149 | 1965 | 7,978 | 1964 | 7,732 | 1963 | 7,254 | 1962 | 6,713 | 1961 | 6,344 | 1960 | 6,067 |
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