| Year | Value | | 2022 | 10,594 | | 2021 | 10,709 | | 2020 | 10,801 | | 2019 | 10,818 | | 2018 | 10,730 | | 2017 | 10,616 | | 2016 | 10,499 | | 2015 | 10,328 | | 2014 | 10,104 | | 2013 | 9,872 | | 2012 | 9,608 | | 2011 | 9,224 | | 2010 | 8,795 | | 2009 | 8,452 | | 2008 | 8,175 | | 2007 | 7,896 | | 2006 | 7,623 | | 2005 | 7,313 | | 2004 | 6,957 | | 2003 | 6,606 | | 2002 | 6,236 | | 2001 | 5,862 | | 2000 | 5,567 | | 1999 | 5,355 | | 1998 | 5,208 | | 1997 | 5,178 | | 1996 | 5,229 | | 1995 | 5,255 | | 1994 | 5,237 | | 1993 | 5,176 | | 1992 | 5,077 | | 1991 | 4,983 | | 1990 | 4,962 | | 1989 | 5,029 | | 1988 | 5,146 | | 1987 | 5,261 | | 1986 | 5,336 | | 1985 | 5,362 | | 1984 | 5,343 | | 1983 | 5,284 | | 1982 | 5,194 | | 1981 | 5,103 | | 1980 | 5,033 | | 1979 | 5,025 | | 1978 | 5,086 | | 1977 | 5,183 | | 1976 | 5,295 | | 1975 | 5,410 | | 1974 | 5,525 | | 1973 | 5,652 | | 1972 | 5,767 | | 1971 | 5,833 | | 1970 | 5,829 | | 1969 | 5,753 | | 1968 | 5,600 | | 1967 | 5,406 | | 1966 | 5,259 | | 1965 | 5,208 | | 1964 | 5,250 | | 1963 | 5,387 | | 1962 | 5,580 | | 1961 | 5,710 | | 1960 | 5,701 |
|