| Year | Value | | 2022 | 39,494 | | 2021 | 39,379 | | 2020 | 39,535 | | 2019 | 39,709 | | 2018 | 39,596 | | 2017 | 39,004 | | 2016 | 38,096 | | 2015 | 37,125 | | 2014 | 36,252 | | 2013 | 35,512 | | 2012 | 34,974 | | 2011 | 34,687 | | 2010 | 34,567 | | 2009 | 34,518 | | 2008 | 34,425 | | 2007 | 34,118 | | 2006 | 32,950 | | 2005 | 31,000 | | 2004 | 29,007 | | 2003 | 27,120 | | 2002 | 25,453 | | 2001 | 24,017 | | 2000 | 22,709 | | 1999 | 21,425 | | 1998 | 20,101 | | 1997 | 18,679 | | 1996 | 17,202 | | 1995 | 15,807 | | 1994 | 14,563 | | 1993 | 13,448 | | 1992 | 12,589 | | 1991 | 11,982 | | 1990 | 11,476 | | 1989 | 11,076 | | 1988 | 10,751 | | 1987 | 10,515 | | 1986 | 10,362 | | 1985 | 10,191 | | 1984 | 9,987 | | 1983 | 9,782 | | 1982 | 9,571 | | 1981 | 9,451 | | 1980 | 9,422 | | 1979 | 9,333 | | 1978 | 9,202 | | 1977 | 9,102 | | 1976 | 9,058 | | 1975 | 9,049 | | 1974 | 9,042 | | 1973 | 9,020 | | 1972 | 8,979 | | 1971 | 8,941 | | 1970 | 8,972 | | 1969 | 8,981 | | 1968 | 8,896 | | 1967 | 8,765 | | 1966 | 8,572 | | 1965 | 8,321 | | 1964 | 8,029 | | 1963 | 7,720 | | 1962 | 7,409 | | 1961 | 7,224 | | 1960 | 7,174 |
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