| Year | Value | | 2022 | 16,275 | | 2021 | 16,274 | | 2020 | 16,089 | | 2019 | 15,706 | | 2018 | 15,270 | | 2017 | 14,884 | | 2016 | 14,555 | | 2015 | 14,242 | | 2014 | 13,935 | | 2013 | 13,633 | | 2012 | 13,272 | | 2011 | 12,837 | | 2010 | 12,379 | | 2009 | 11,916 | | 2008 | 11,461 | | 2007 | 11,030 | | 2006 | 10,641 | | 2005 | 10,299 | | 2004 | 9,990 | | 2003 | 9,706 | | 2002 | 9,453 | | 2001 | 9,217 | | 2000 | 8,991 | | 1999 | 8,797 | | 1998 | 8,654 | | 1997 | 8,546 | | 1996 | 8,439 | | 1995 | 8,319 | | 1994 | 8,188 | | 1993 | 8,008 | | 1992 | 7,780 | | 1991 | 7,556 | | 1990 | 7,350 | | 1989 | 7,143 | | 1988 | 6,977 | | 1987 | 6,864 | | 1986 | 6,759 | | 1985 | 6,666 | | 1984 | 6,592 | | 1983 | 6,534 | | 1982 | 6,494 | | 1981 | 6,463 | | 1980 | 6,422 | | 1979 | 6,357 | | 1978 | 6,274 | | 1977 | 6,181 | | 1976 | 6,090 | | 1975 | 6,013 | | 1974 | 5,955 | | 1973 | 5,918 | | 1972 | 5,888 | | 1971 | 5,849 | | 1970 | 5,793 | | 1969 | 5,717 | | 1968 | 5,622 | | 1967 | 5,508 | | 1966 | 5,376 | | 1965 | 5,229 | | 1964 | 5,063 | | 1963 | 4,870 | | 1962 | 4,673 | | 1961 | 4,509 | | 1960 | 4,405 |
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