| Year | Value | | 2022 | 4,221 | | 2021 | 3,572 | | 2020 | 3,575 | | 2019 | 3,578 | | 2018 | 3,544 | | 2017 | 3,500 | | 2016 | 3,455 | | 2015 | 3,345 | | 2014 | 3,191 | | 2013 | 3,100 | | 2012 | 3,032 | | 2011 | 3,033 | | 2010 | 3,178 | | 2009 | 3,149 | | 2008 | 3,196 | | 2007 | 3,178 | | 2006 | 3,178 | | 2005 | 3,096 | | 2004 | 3,033 | | 2003 | 2,953 | | 2002 | 2,879 | | 2001 | 2,688 | | 2000 | 2,570 | | 1999 | 2,422 | | 1998 | 2,250 | | 1997 | 2,066 | | 1996 | 1,897 | | 1995 | 1,756 | | 1994 | 1,637 | | 1993 | 1,510 | | 1992 | 1,407 | | 1991 | 1,345 | | 1990 | 1,284 | | 1989 | 1,250 | | 1988 | 1,233 | | 1987 | 1,236 | | 1986 | 1,200 | | 1985 | 1,209 | | 1984 | 1,222 | | 1983 | 1,245 | | 1982 | 1,277 | | 1981 | 1,305 | | 1980 | 1,330 | | 1979 | 1,352 | | 1978 | 1,362 | | 1977 | 1,369 | | 1976 | 1,350 | | 1975 | 1,328 | | 1974 | 1,307 | | 1973 | 1,293 | | 1972 | 1,280 | | 1971 | 1,257 | | 1970 | 1,237 | | 1969 | 1,215 | | 1968 | 1,199 | | 1967 | 1,188 | | 1966 | 1,176 | | 1965 | 1,161 | | 1964 | 1,144 | | 1963 | 1,125 | | 1962 | 1,102 | | 1961 | 1,077 | | 1960 | 1,050 |
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