| Year | Value | | 2022 | 8,332 | | 2021 | 8,411 | | 2020 | 8,381 | | 2019 | 8,251 | | 2018 | 8,061 | | 2017 | 7,851 | | 2016 | 7,652 | | 2015 | 7,489 | | 2014 | 7,370 | | 2013 | 7,286 | | 2012 | 7,218 | | 2011 | 7,140 | | 2010 | 7,020 | | 2009 | 6,949 | | 2008 | 6,930 | | 2007 | 6,874 | | 2006 | 6,812 | | 2005 | 6,771 | | 2004 | 6,734 | | 2003 | 6,677 | | 2002 | 6,596 | | 2001 | 6,505 | | 2000 | 6,434 | | 1999 | 6,368 | | 1998 | 6,302 | | 1997 | 6,260 | | 1996 | 6,246 | | 1995 | 6,235 | | 1994 | 6,207 | | 1993 | 6,131 | | 1992 | 5,981 | | 1991 | 5,806 | | 1990 | 5,659 | | 1989 | 5,529 | | 1988 | 5,403 | | 1987 | 5,257 | | 1986 | 5,081 | | 1985 | 4,877 | | 1984 | 4,654 | | 1983 | 4,436 | | 1982 | 4,234 | | 1981 | 4,051 | | 1980 | 3,870 | | 1979 | 3,688 | | 1978 | 3,519 | | 1977 | 3,364 | | 1976 | 3,218 | | 1975 | 3,073 | | 1974 | 2,937 | | 1973 | 2,805 | | 1972 | 2,671 | | 1971 | 2,535 | | 1970 | 2,406 | | 1969 | 2,337 | | 1968 | 2,334 | | 1967 | 2,340 | | 1966 | 2,350 | | 1965 | 2,364 | | 1964 | 2,382 | | 1963 | 2,403 | | 1962 | 2,426 | | 1961 | 2,453 | | 1960 | 2,483 |
|