| Year | Value | | 2022 | 8,732 | | 2021 | 8,515 | | 2020 | 8,115 | | 2019 | 7,546 | | 2018 | 7,133 | | 2017 | 6,735 | | 2016 | 6,413 | | 2015 | 6,117 | | 2014 | 5,864 | | 2013 | 5,648 | | 2012 | 5,459 | | 2011 | 5,323 | | 2010 | 5,113 | | 2009 | 4,808 | | 2008 | 4,574 | | 2007 | 4,424 | | 2006 | 4,318 | | 2005 | 4,225 | | 2004 | 4,150 | | 2003 | 4,117 | | 2002 | 4,086 | | 2001 | 3,973 | | 2000 | 3,821 | | 1999 | 3,792 | | 1998 | 3,903 | | 1997 | 4,072 | | 1996 | 4,232 | | 1995 | 4,339 | | 1994 | 4,407 | | 1993 | 4,458 | | 1992 | 4,495 | | 1991 | 4,514 | | 1990 | 4,531 | | 1989 | 4,574 | | 1988 | 4,621 | | 1987 | 4,659 | | 1986 | 4,665 | | 1985 | 4,601 | | 1984 | 4,473 | | 1983 | 4,316 | | 1982 | 4,139 | | 1981 | 3,922 | | 1980 | 3,678 | | 1979 | 3,433 | | 1978 | 3,317 | | 1977 | 3,335 | | 1976 | 3,353 | | 1975 | 3,347 | | 1974 | 3,306 | | 1973 | 3,224 | | 1972 | 3,118 | | 1971 | 3,001 | | 1970 | 2,883 | | 1969 | 2,765 | | 1968 | 2,621 | | 1967 | 2,472 | | 1966 | 2,363 | | 1965 | 2,283 | | 1964 | 2,218 | | 1963 | 2,157 | | 1962 | 1,860 | | 1961 | 1,394 | | 1960 | 1,045 |
|