Year | Value | 2022 | 20,852 | 2021 | 20,814 | 2020 | 20,997 | 2019 | 21,449 | 2018 | 21,846 | 2017 | 21,929 | 2016 | 21,863 | 2015 | 21,653 | 2014 | 21,364 | 2013 | 21,010 | 2012 | 20,605 | 2011 | 20,012 | 2010 | 19,347 | 2009 | 18,779 | 2008 | 18,178 | 2007 | 17,431 | 2006 | 16,526 | 2005 | 15,535 | 2004 | 14,727 | 2003 | 14,404 | 2002 | 14,116 | 2001 | 13,563 | 2000 | 12,999 | 1999 | 12,379 | 1998 | 11,596 | 1997 | 10,382 | 1996 | 9,540 | 1995 | 9,231 | 1994 | 9,130 | 1993 | 9,139 | 1992 | 8,732 | 1991 | 8,174 | 1990 | 9,328 | 1989 | 10,599 | 1988 | 10,242 | 1987 | 9,885 | 1986 | 9,512 | 1985 | 9,127 | 1984 | 8,720 | 1983 | 8,557 | 1982 | 8,426 | 1981 | 8,115 | 1980 | 7,896 | 1979 | 7,759 | 1978 | 7,691 | 1977 | 7,674 | 1976 | 7,688 | 1975 | 7,720 | 1974 | 7,615 | 1973 | 7,363 | 1972 | 7,115 | 1971 | 6,879 | 1970 | 6,663 | 1969 | 6,463 | 1968 | 6,279 | 1967 | 6,105 | 1966 | 5,934 | 1965 | 5,758 | 1964 | 5,579 | 1963 | 5,396 | 1962 | 5,227 | 1961 | 5,080 | 1960 | 4,948 |
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