| Year | Value | | 2022 | 5,837 | | 2021 | 5,571 | | 2020 | 5,358 | | 2019 | 5,448 | | 2018 | 4,963 | | 2017 | 4,160 | | 2016 | 4,077 | | 2015 | 3,944 | | 2014 | 3,776 | | 2013 | 3,602 | | 2012 | 3,458 | | 2011 | 3,392 | | 2010 | 3,400 | | 2009 | 3,447 | | 2008 | 3,482 | | 2007 | 3,464 | | 2006 | 3,392 | | 2005 | 3,302 | | 2004 | 3,318 | | 2003 | 3,468 | | 2002 | 3,641 | | 2001 | 3,923 | | 2000 | 4,374 | | 1999 | 4,829 | | 1998 | 5,238 | | 1997 | 5,522 | | 1996 | 5,659 | | 1995 | 5,741 | | 1994 | 5,815 | | 1993 | 5,858 | | 1992 | 5,859 | | 1991 | 5,850 | | 1990 | 5,812 | | 1989 | 5,758 | | 1988 | 5,711 | | 1987 | 5,658 | | 1986 | 5,577 | | 1985 | 5,461 | | 1984 | 5,324 | | 1983 | 5,196 | | 1982 | 5,072 | | 1981 | 4,935 | | 1980 | 4,830 | | 1979 | 4,748 | | 1978 | 4,682 | | 1977 | 4,619 | | 1976 | 4,509 | | 1975 | 4,394 | | 1974 | 4,274 | | 1973 | 4,158 | | 1972 | 4,147 | | 1971 | 4,155 | | 1970 | 4,125 | | 1969 | 4,112 | | 1968 | 4,090 | | 1967 | 4,059 | | 1966 | 4,037 | | 1965 | 4,011 | | 1964 | 3,970 | | 1963 | 3,938 | | 1962 | 3,911 | | 1961 | 3,896 | | 1960 | 3,904 |
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