| Year | Value | | 2022 | 3,547 | | 2021 | 3,540 | | 2020 | 3,513 | | 2019 | 3,467 | | 2018 | 3,435 | | 2017 | 3,394 | | 2016 | 3,336 | | 2015 | 3,295 | | 2014 | 3,252 | | 2013 | 3,180 | | 2012 | 3,120 | | 2011 | 3,092 | | 2010 | 3,056 | | 2009 | 3,006 | | 2008 | 2,977 | | 2007 | 2,970 | | 2006 | 2,979 | | 2005 | 3,013 | | 2004 | 3,064 | | 2003 | 3,109 | | 2002 | 3,139 | | 2001 | 3,143 | | 2000 | 3,143 | | 1999 | 3,152 | | 1998 | 3,133 | | 1997 | 3,068 | | 1996 | 2,976 | | 1995 | 2,872 | | 1994 | 2,777 | | 1993 | 2,706 | | 1992 | 2,640 | | 1991 | 2,558 | | 1990 | 2,497 | | 1989 | 2,440 | | 1988 | 2,329 | | 1987 | 2,175 | | 1986 | 1,984 | | 1985 | 1,777 | | 1984 | 1,571 | | 1983 | 1,423 | | 1982 | 1,340 | | 1981 | 1,276 | | 1980 | 1,222 | | 1979 | 1,169 | | 1978 | 1,115 | | 1977 | 1,064 | | 1976 | 1,021 | | 1975 | 989 | | 1974 | 971 | | 1973 | 971 | | 1972 | 987 | | 1971 | 1,009 | | 1970 | 1,034 | | 1969 | 1,125 | | 1968 | 1,254 | | 1967 | 1,330 | | 1966 | 1,354 | | 1965 | 1,336 | | 1964 | 1,288 | | 1963 | 1,252 | | 1962 | 1,239 | | 1961 | 1,229 | | 1960 | 1,210 |
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