| Year | Value | | 2022 | 27,122 | | 2021 | 26,695 | | 2020 | 26,610 | | 2019 | 26,424 | | 2018 | 25,863 | | 2017 | 25,202 | | 2016 | 24,517 | | 2015 | 23,836 | | 2014 | 23,080 | | 2013 | 22,197 | | 2012 | 21,183 | | 2011 | 20,006 | | 2010 | 18,669 | | 2009 | 17,292 | | 2008 | 16,001 | | 2007 | 14,828 | | 2006 | 13,801 | | 2005 | 12,958 | | 2004 | 12,296 | | 2003 | 11,774 | | 2002 | 11,359 | | 2001 | 11,019 | | 2000 | 10,683 | | 1999 | 10,306 | | 1998 | 9,910 | | 1997 | 9,511 | | 1996 | 9,135 | | 1995 | 8,806 | | 1994 | 8,514 | | 1993 | 8,250 | | 1992 | 8,008 | | 1991 | 7,763 | | 1990 | 7,506 | | 1989 | 7,246 | | 1988 | 6,995 | | 1987 | 6,768 | | 1986 | 6,558 | | 1985 | 6,362 | | 1984 | 6,180 | | 1983 | 5,998 | | 1982 | 5,805 | | 1981 | 5,614 | | 1980 | 5,443 | | 1979 | 5,326 | | 1978 | 5,253 | | 1977 | 5,162 | | 1976 | 5,044 | | 1975 | 4,896 | | 1974 | 4,722 | | 1973 | 4,515 | | 1972 | 4,314 | | 1971 | 4,127 | | 1970 | 3,952 | | 1969 | 3,821 | | 1968 | 3,738 | | 1967 | 3,697 | | 1966 | 3,665 | | 1965 | 3,614 | | 1964 | 3,546 | | 1963 | 3,458 | | 1962 | 3,351 | | 1961 | 3,247 | | 1960 | 3,162 |
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