| Year | Value | | 2022 | 5,264 | | 2021 | 4,369 | | 2020 | 4,317 | | 2019 | 4,272 | | 2018 | 4,167 | | 2017 | 4,052 | | 2016 | 3,955 | | 2015 | 3,806 | | 2014 | 3,616 | | 2013 | 3,513 | | 2012 | 3,435 | | 2011 | 3,393 | | 2010 | 3,471 | | 2009 | 3,375 | | 2008 | 3,382 | | 2007 | 3,335 | | 2006 | 3,352 | | 2005 | 3,330 | | 2004 | 3,341 | | 2003 | 3,333 | | 2002 | 3,317 | | 2001 | 3,131 | | 2000 | 2,998 | | 1999 | 2,808 | | 1998 | 2,586 | | 1997 | 2,333 | | 1996 | 2,143 | | 1995 | 2,034 | | 1994 | 1,935 | | 1993 | 1,811 | | 1992 | 1,700 | | 1991 | 1,628 | | 1990 | 1,550 | | 1989 | 1,494 | | 1988 | 1,439 | | 1987 | 1,400 | | 1986 | 1,319 | | 1985 | 1,291 | | 1984 | 1,268 | | 1983 | 1,255 | | 1982 | 1,259 | | 1981 | 1,266 | | 1980 | 1,276 | | 1979 | 1,295 | | 1978 | 1,318 | | 1977 | 1,344 | | 1976 | 1,346 | | 1975 | 1,339 | | 1974 | 1,325 | | 1973 | 1,313 | | 1972 | 1,301 | | 1971 | 1,275 | | 1970 | 1,253 | | 1969 | 1,229 | | 1968 | 1,205 | | 1967 | 1,183 | | 1966 | 1,163 | | 1965 | 1,143 | | 1964 | 1,123 | | 1963 | 1,101 | | 1962 | 1,076 | | 1961 | 1,048 | | 1960 | 1,021 |
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