| Year | Value | | 2022 | 21,467 | | 2021 | 20,462 | | 2020 | 19,409 | | 2019 | 18,342 | | 2018 | 17,242 | | 2017 | 16,140 | | 2016 | 15,159 | | 2015 | 14,243 | | 2014 | 13,391 | | 2013 | 12,603 | | 2012 | 11,889 | | 2011 | 11,254 | | 2010 | 10,700 | | 2009 | 10,227 | | 2008 | 9,852 | | 2007 | 9,555 | | 2006 | 9,305 | | 2005 | 9,100 | | 2004 | 8,906 | | 2003 | 8,728 | | 2002 | 8,573 | | 2001 | 8,438 | | 2000 | 8,345 | | 1999 | 8,295 | | 1998 | 8,247 | | 1997 | 8,181 | | 1996 | 8,118 | | 1995 | 8,049 | | 1994 | 8,002 | | 1993 | 7,984 | | 1992 | 7,965 | | 1991 | 7,932 | | 1990 | 7,872 | | 1989 | 7,791 | | 1988 | 7,689 | | 1987 | 7,571 | | 1986 | 7,435 | | 1985 | 7,282 | | 1984 | 7,133 | | 1983 | 6,969 | | 1982 | 6,808 | | 1981 | 6,671 | | 1980 | 6,540 | | 1979 | 6,409 | | 1978 | 6,276 | | 1977 | 6,151 | | 1976 | 6,026 | | 1975 | 5,873 | | 1974 | 5,679 | | 1973 | 5,469 | | 1972 | 5,263 | | 1971 | 5,052 | | 1970 | 4,837 | | 1969 | 4,653 | | 1968 | 4,499 | | 1967 | 4,340 | | 1966 | 4,174 | | 1965 | 4,009 | | 1964 | 3,848 | | 1963 | 3,686 | | 1962 | 3,525 | | 1961 | 3,373 | | 1960 | 3,264 |
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