| Year | Value | | 2022 | 3,698 | | 2021 | 3,535 | | 2020 | 3,388 | | 2019 | 3,243 | | 2018 | 3,127 | | 2017 | 3,051 | | 2016 | 2,997 | | 2015 | 2,981 | | 2014 | 3,010 | | 2013 | 3,072 | | 2012 | 3,147 | | 2011 | 3,218 | | 2010 | 3,251 | | 2009 | 3,228 | | 2008 | 3,159 | | 2007 | 3,059 | | 2006 | 2,940 | | 2005 | 2,839 | | 2004 | 2,757 | | 2003 | 2,671 | | 2002 | 2,583 | | 2001 | 2,499 | | 2000 | 2,402 | | 1999 | 2,288 | | 1998 | 2,177 | | 1997 | 2,075 | | 1996 | 1,993 | | 1995 | 1,930 | | 1994 | 1,884 | | 1993 | 1,844 | | 1992 | 1,800 | | 1991 | 1,744 | | 1990 | 1,676 | | 1989 | 1,598 | | 1988 | 1,529 | | 1987 | 1,482 | | 1986 | 1,452 | | 1985 | 1,435 | | 1984 | 1,420 | | 1983 | 1,400 | | 1982 | 1,371 | | 1981 | 1,333 | | 1980 | 1,290 | | 1979 | 1,245 | | 1978 | 1,230 | | 1977 | 1,254 | | 1976 | 1,284 | | 1975 | 1,314 | | 1974 | 1,343 | | 1973 | 1,356 | | 1972 | 1,339 | | 1971 | 1,306 | | 1970 | 1,264 | | 1969 | 1,218 | | 1968 | 1,200 | | 1967 | 1,210 | | 1966 | 1,210 | | 1965 | 1,187 | | 1964 | 1,150 | | 1963 | 1,120 | | 1962 | 1,097 | | 1961 | 1,080 | | 1960 | 1,070 |
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