| Year | Value | | 2022 | 4,833 | | 2021 | 4,973 | | 2020 | 5,141 | | 2019 | 5,339 | | 2018 | 5,540 | | 2017 | 5,711 | | 2016 | 5,827 | | 2015 | 5,868 | | 2014 | 5,827 | | 2013 | 5,710 | | 2012 | 5,521 | | 2011 | 5,270 | | 2010 | 4,979 | | 2009 | 4,658 | | 2008 | 4,325 | | 2007 | 4,020 | | 2006 | 3,769 | | 2005 | 3,585 | | 2004 | 3,474 | | 2003 | 3,416 | | 2002 | 3,413 | | 2001 | 3,438 | | 2000 | 3,484 | | 1999 | 3,536 | | 1998 | 3,567 | | 1997 | 3,601 | | 1996 | 3,664 | | 1995 | 3,766 | | 1994 | 3,899 | | 1993 | 4,042 | | 1992 | 4,173 | | 1991 | 4,272 | | 1990 | 4,380 | | 1989 | 4,508 | | 1988 | 4,610 | | 1987 | 4,660 | | 1986 | 4,632 | | 1985 | 4,506 | | 1984 | 4,292 | | 1983 | 4,021 | | 1982 | 3,734 | | 1981 | 3,471 | | 1980 | 3,287 | | 1979 | 3,198 | | 1978 | 3,145 | | 1977 | 3,096 | | 1976 | 3,053 | | 1975 | 3,004 | | 1974 | 2,935 | | 1973 | 2,835 | | 1972 | 2,712 | | 1971 | 2,573 | | 1970 | 2,457 | | 1969 | 2,439 | | 1968 | 2,511 | | 1967 | 2,614 | | 1966 | 2,730 | | 1965 | 2,840 | | 1964 | 2,938 | | 1963 | 3,016 | | 1962 | 3,067 | | 1961 | 3,092 | | 1960 | 3,084 |
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