| Year | Value | | 2022 | 5,673 | | 2021 | 5,693 | | 2020 | 5,708 | | 2019 | 5,740 | | 2018 | 5,776 | | 2017 | 5,797 | | 2016 | 5,804 | | 2015 | 5,799 | | 2014 | 5,784 | | 2013 | 5,748 | | 2012 | 5,678 | | 2011 | 5,569 | | 2010 | 5,436 | | 2009 | 5,304 | | 2008 | 5,198 | | 2007 | 5,140 | | 2006 | 5,128 | | 2005 | 5,149 | | 2004 | 5,180 | | 2003 | 5,192 | | 2002 | 5,168 | | 2001 | 5,114 | | 2000 | 5,036 | | 1999 | 4,928 | | 1998 | 4,801 | | 1997 | 4,665 | | 1996 | 4,526 | | 1995 | 4,385 | | 1994 | 4,244 | | 1993 | 4,107 | | 1992 | 3,976 | | 1991 | 3,847 | | 1990 | 3,723 | | 1989 | 3,600 | | 1988 | 3,470 | | 1987 | 3,350 | | 1986 | 3,277 | | 1985 | 3,251 | | 1984 | 3,244 | | 1983 | 3,247 | | 1982 | 3,252 | | 1981 | 3,267 | | 1980 | 3,299 | | 1979 | 3,341 | | 1978 | 3,387 | | 1977 | 3,425 | | 1976 | 3,390 | | 1975 | 3,271 | | 1974 | 3,133 | | 1973 | 3,055 | | 1972 | 3,047 | | 1971 | 3,061 | | 1970 | 3,097 | | 1969 | 3,141 | | 1968 | 3,169 | | 1967 | 3,160 | | 1966 | 3,102 | | 1965 | 3,001 | | 1964 | 2,884 | | 1963 | 2,761 | | 1962 | 2,640 | | 1961 | 2,541 | | 1960 | 2,460 |
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