| Year | Value | | 2022 | 14,096 | | 2021 | 13,632 | | 2020 | 13,312 | | 2019 | 13,111 | | 2018 | 13,038 | | 2017 | 13,032 | | 2016 | 13,007 | | 2015 | 12,920 | | 2014 | 12,761 | | 2013 | 12,523 | | 2012 | 12,249 | | 2011 | 12,017 | | 2010 | 11,882 | | 2009 | 11,795 | | 2008 | 11,769 | | 2007 | 11,738 | | 2006 | 11,555 | | 2005 | 11,247 | | 2004 | 10,856 | | 2003 | 10,432 | | 2002 | 10,102 | | 2001 | 9,977 | | 2000 | 9,979 | | 1999 | 10,133 | | 1998 | 10,372 | | 1997 | 10,466 | | 1996 | 10,304 | | 1995 | 9,905 | | 1994 | 9,363 | | 1993 | 8,709 | | 1992 | 8,094 | | 1991 | 7,710 | | 1990 | 7,525 | | 1989 | 7,428 | | 1988 | 7,308 | | 1987 | 7,051 | | 1986 | 6,669 | | 1985 | 6,228 | | 1984 | 5,776 | | 1983 | 5,525 | | 1982 | 5,533 | | 1981 | 5,661 | | 1980 | 5,819 | | 1979 | 5,919 | | 1978 | 5,941 | | 1977 | 5,888 | | 1976 | 5,791 | | 1975 | 5,673 | | 1974 | 5,524 | | 1973 | 5,350 | | 1972 | 5,173 | | 1971 | 5,002 | | 1970 | 4,843 | | 1969 | 4,694 | | 1968 | 4,555 | | 1967 | 4,429 | | 1966 | 4,306 | | 1965 | 4,185 | | 1964 | 4,066 | | 1963 | 3,950 | | 1962 | 3,834 | | 1961 | 3,722 | | 1960 | 3,612 |
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