| Year | Value | | 2022 | 24,637 | | 2021 | 24,393 | | 2020 | 23,731 | | 2019 | 22,544 | | 2018 | 21,049 | | 2017 | 19,554 | | 2016 | 18,107 | | 2015 | 16,404 | | 2014 | 14,884 | | 2013 | 13,881 | | 2012 | 13,087 | | 2011 | 12,367 | | 2010 | 11,597 | | 2009 | 10,950 | | 2008 | 10,380 | | 2007 | 9,854 | | 2006 | 9,027 | | 2005 | 8,250 | | 2004 | 7,894 | | 2003 | 7,586 | | 2002 | 7,318 | | 2001 | 7,079 | | 2000 | 6,857 | | 1999 | 6,648 | | 1998 | 6,445 | | 1997 | 6,237 | | 1996 | 6,022 | | 1995 | 5,800 | | 1994 | 5,576 | | 1993 | 5,363 | | 1992 | 5,169 | | 1991 | 4,998 | | 1990 | 4,849 | | 1989 | 4,692 | | 1988 | 4,520 | | 1987 | 4,360 | | 1986 | 4,220 | | 1985 | 4,102 | | 1984 | 4,003 | | 1983 | 3,922 | | 1982 | 3,858 | | 1981 | 3,806 | | 1980 | 3,766 | | 1979 | 3,739 | | 1978 | 3,722 | | 1977 | 3,708 | | 1976 | 3,682 | | 1975 | 3,637 | | 1974 | 3,572 | | 1973 | 3,484 | | 1972 | 3,381 | | 1971 | 3,269 | | 1970 | 3,146 | | 1969 | 3,005 | | 1968 | 2,846 | | 1967 | 2,685 | | 1966 | 2,540 | | 1965 | 2,425 | | 1964 | 2,344 | | 1963 | 2,296 | | 1962 | 2,259 | | 1961 | 2,209 | | 1960 | 2,138 |
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