| Year | Value | | 2022 | 9,828 | | 2021 | 9,619 | | 2020 | 9,383 | | 2019 | 9,017 | | 2018 | 8,659 | | 2017 | 8,370 | | 2016 | 8,119 | | 2015 | 7,902 | | 2014 | 7,850 | | 2013 | 7,871 | | 2012 | 7,834 | | 2011 | 7,802 | | 2010 | 7,733 | | 2009 | 7,623 | | 2008 | 7,505 | | 2007 | 7,395 | | 2006 | 7,296 | | 2005 | 7,183 | | 2004 | 7,047 | | 2003 | 6,915 | | 2002 | 6,762 | | 2001 | 6,656 | | 2000 | 6,563 | | 1999 | 6,410 | | 1998 | 6,263 | | 1997 | 6,132 | | 1996 | 6,025 | | 1995 | 5,974 | | 1994 | 5,967 | | 1993 | 5,994 | | 1992 | 6,097 | | 1991 | 6,266 | | 1990 | 6,483 | | 1989 | 6,727 | | 1988 | 6,948 | | 1987 | 7,114 | | 1986 | 7,254 | | 1985 | 7,378 | | 1984 | 7,487 | | 1983 | 7,572 | | 1982 | 7,625 | | 1981 | 7,644 | | 1980 | 7,624 | | 1979 | 7,567 | | 1978 | 7,484 | | 1977 | 7,373 | | 1976 | 7,223 | | 1975 | 7,064 | | 1974 | 6,904 | | 1973 | 6,702 | | 1972 | 6,473 | | 1971 | 6,260 | | 1970 | 6,090 | | 1969 | 5,960 | | 1968 | 5,880 | | 1967 | 5,849 | | 1966 | 5,837 | | 1965 | 5,823 | | 1964 | 5,815 | | 1963 | 5,818 | | 1962 | 5,823 | | 1961 | 5,824 | | 1960 | 5,811 |
|