| Year | Value | | 2022 | 9,795 | | 2021 | 9,972 | | 2020 | 10,110 | | 2019 | 10,183 | | 2018 | 10,207 | | 2017 | 10,225 | | 2016 | 10,229 | | 2015 | 10,188 | | 2014 | 10,072 | | 2013 | 9,834 | | 2012 | 9,660 | | 2011 | 9,592 | | 2010 | 9,612 | | 2009 | 9,681 | | 2008 | 9,760 | | 2007 | 9,827 | | 2006 | 9,857 | | 2005 | 9,688 | | 2004 | 9,470 | | 2003 | 9,357 | | 2002 | 9,214 | | 2001 | 9,059 | | 2000 | 8,905 | | 1999 | 8,752 | | 1998 | 8,595 | | 1997 | 8,410 | | 1996 | 8,162 | | 1995 | 7,865 | | 1994 | 7,544 | | 1993 | 7,210 | | 1992 | 6,893 | | 1991 | 6,585 | | 1990 | 6,284 | | 1989 | 5,943 | | 1988 | 5,659 | | 1987 | 5,528 | | 1986 | 5,471 | | 1985 | 5,459 | | 1984 | 5,498 | | 1983 | 5,534 | | 1982 | 5,516 | | 1981 | 5,439 | | 1980 | 5,323 | | 1979 | 5,207 | | 1978 | 5,089 | | 1977 | 4,956 | | 1976 | 4,845 | | 1975 | 4,780 | | 1974 | 4,717 | | 1973 | 4,630 | | 1972 | 4,537 | | 1971 | 4,348 | | 1970 | 4,062 | | 1969 | 3,741 | | 1968 | 3,549 | | 1967 | 3,458 | | 1966 | 3,381 | | 1965 | 3,305 | | 1964 | 3,251 | | 1963 | 3,194 | | 1962 | 3,131 | | 1961 | 3,060 | | 1960 | 2,979 |
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