| Year | Value | | 2022 | 11,909 | | 2021 | 11,964 | | 2020 | 12,066 | | 2019 | 12,107 | | 2018 | 12,098 | | 2017 | 12,123 | | 2016 | 12,180 | | 2015 | 12,274 | | 2014 | 12,417 | | 2013 | 12,620 | | 2012 | 12,179 | | 2011 | 11,045 | | 2010 | 9,895 | | 2009 | 8,745 | | 2008 | 7,601 | | 2007 | 6,940 | | 2006 | 6,762 | | 2005 | 6,596 | | 2004 | 6,438 | | 2003 | 6,286 | | 2002 | 6,139 | | 2001 | 5,999 | | 2000 | 5,842 | | 1999 | 5,661 | | 1998 | 5,495 | | 1997 | 5,343 | | 1996 | 5,219 | | 1995 | 5,114 | | 1994 | 4,979 | | 1993 | 4,817 | | 1992 | 4,624 | | 1991 | 4,444 | | 1990 | 4,305 | | 1989 | 4,187 | | 1988 | 4,074 | | 1987 | 3,948 | | 1986 | 3,824 | | 1985 | 3,702 | | 1984 | 3,582 | | 1983 | 3,463 | | 1982 | 3,346 | | 1981 | 3,234 | | 1980 | 3,127 | | 1979 | 3,026 | | 1978 | 2,929 | | 1977 | 2,837 | | 1976 | 2,747 | | 1975 | 2,657 | | 1974 | 2,568 | | 1973 | 2,477 | | 1972 | 2,383 | | 1971 | 2,285 | | 1970 | 2,187 | | 1969 | 2,090 | | 1968 | 1,994 | | 1967 | 1,900 | | 1966 | 1,807 | | 1965 | 1,715 | | 1964 | 1,624 | | 1963 | 1,536 | | 1962 | 1,448 | | 1961 | 1,363 | | 1960 | 1,279 |
|