| Year | Value | | 2022 | 12,625 | | 2021 | 12,396 | | 2020 | 12,081 | | 2019 | 11,691 | | 2018 | 11,269 | | 2017 | 10,840 | | 2016 | 10,391 | | 2015 | 9,929 | | 2014 | 9,464 | | 2013 | 8,988 | | 2012 | 8,471 | | 2011 | 7,891 | | 2010 | 7,257 | | 2009 | 6,563 | | 2008 | 5,864 | | 2007 | 5,261 | | 2006 | 4,799 | | 2005 | 4,491 | | 2004 | 4,314 | | 2003 | 4,238 | | 2002 | 4,242 | | 2001 | 4,300 | | 2000 | 4,399 | | 1999 | 4,546 | | 1998 | 4,734 | | 1997 | 4,934 | | 1996 | 5,136 | | 1995 | 5,330 | | 1994 | 5,508 | | 1993 | 5,653 | | 1992 | 5,761 | | 1991 | 5,834 | | 1990 | 5,863 | | 1989 | 5,815 | | 1988 | 5,696 | | 1987 | 5,547 | | 1986 | 5,379 | | 1985 | 5,209 | | 1984 | 5,039 | | 1983 | 4,873 | | 1982 | 4,716 | | 1981 | 4,575 | | 1980 | 4,475 | | 1979 | 4,411 | | 1978 | 4,361 | | 1977 | 4,328 | | 1976 | 4,310 | | 1975 | 4,301 | | 1974 | 4,303 | | 1973 | 4,313 | | 1972 | 4,328 | | 1971 | 4,351 | | 1970 | 4,372 | | 1969 | 4,376 | | 1968 | 4,369 | | 1967 | 4,363 | | 1966 | 4,352 | | 1965 | 4,336 | | 1964 | 4,312 | | 1963 | 4,278 | | 1962 | 4,234 | | 1961 | 4,194 | | 1960 | 4,123 |
|