| Year | Value | | 2022 | 3,274 | | 2021 | 3,344 | | 2020 | 3,382 | | 2019 | 3,387 | | 2018 | 3,357 | | 2017 | 3,302 | | 2016 | 3,218 | | 2015 | 3,114 | | 2014 | 3,004 | | 2013 | 2,879 | | 2012 | 2,742 | | 2011 | 2,615 | | 2010 | 2,483 | | 2009 | 2,341 | | 2008 | 2,205 | | 2007 | 2,076 | | 2006 | 1,946 | | 2005 | 1,812 | | 2004 | 1,685 | | 2003 | 1,573 | | 2002 | 1,467 | | 2001 | 1,404 | | 2000 | 1,397 | | 1999 | 1,407 | | 1998 | 1,424 | | 1997 | 1,436 | | 1996 | 1,433 | | 1995 | 1,410 | | 1994 | 1,378 | | 1993 | 1,339 | | 1992 | 1,295 | | 1991 | 1,250 | | 1990 | 1,237 | | 1989 | 1,253 | | 1988 | 1,275 | | 1987 | 1,296 | | 1986 | 1,307 | | 1985 | 1,316 | | 1984 | 1,315 | | 1983 | 1,302 | | 1982 | 1,280 | | 1981 | 1,253 | | 1980 | 1,225 | | 1979 | 1,208 | | 1978 | 1,201 | | 1977 | 1,205 | | 1976 | 1,219 | | 1975 | 1,228 | | 1974 | 1,228 | | 1973 | 1,224 | | 1972 | 1,214 | | 1971 | 1,203 | | 1970 | 1,203 | | 1969 | 1,227 | | 1968 | 1,265 | | 1967 | 1,297 | | 1966 | 1,316 | | 1965 | 1,314 | | 1964 | 1,292 | | 1963 | 1,252 | | 1962 | 1,204 | | 1961 | 1,159 | | 1960 | 1,118 |
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