| Year | Value | | 2022 | 8,905 | | 2021 | 9,246 | | 2020 | 9,573 | | 2019 | 9,844 | | 2018 | 10,001 | | 2017 | 10,075 | | 2016 | 10,138 | | 2015 | 10,215 | | 2014 | 10,246 | | 2013 | 10,069 | | 2012 | 9,786 | | 2011 | 9,479 | | 2010 | 9,215 | | 2009 | 9,084 | | 2008 | 9,076 | | 2007 | 9,104 | | 2006 | 9,172 | | 2005 | 9,171 | | 2004 | 9,203 | | 2003 | 9,346 | | 2002 | 9,427 | | 2001 | 9,427 | | 2000 | 9,375 | | 1999 | 9,266 | | 1998 | 9,109 | | 1997 | 8,946 | | 1996 | 8,770 | | 1995 | 8,578 | | 1994 | 8,364 | | 1993 | 8,118 | | 1992 | 7,850 | | 1991 | 7,559 | | 1990 | 7,237 | | 1989 | 6,833 | | 1988 | 6,449 | | 1987 | 6,175 | | 1986 | 5,946 | | 1985 | 5,749 | | 1984 | 5,604 | | 1983 | 5,471 | | 1982 | 5,311 | | 1981 | 5,146 | | 1980 | 5,009 | | 1979 | 4,933 | | 1978 | 4,890 | | 1977 | 4,846 | | 1976 | 4,813 | | 1975 | 4,793 | | 1974 | 4,733 | | 1973 | 4,619 | | 1972 | 4,481 | | 1971 | 4,262 | | 1970 | 3,976 | | 1969 | 3,675 | | 1968 | 3,497 | | 1967 | 3,396 | | 1966 | 3,287 | | 1965 | 3,166 | | 1964 | 3,063 | | 1963 | 2,971 | | 1962 | 2,893 | | 1961 | 2,815 | | 1960 | 2,736 |
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