| Year | Value | | 2022 | 4,760 | | 2021 | 4,948 | | 2020 | 5,135 | | 2019 | 5,330 | | 2018 | 5,529 | | 2017 | 5,705 | | 2016 | 5,847 | | 2015 | 5,960 | | 2014 | 6,037 | | 2013 | 6,072 | | 2012 | 6,071 | | 2011 | 6,037 | | 2010 | 5,965 | | 2009 | 5,867 | | 2008 | 5,753 | | 2007 | 5,616 | | 2006 | 5,455 | | 2005 | 5,289 | | 2004 | 5,131 | | 2003 | 4,994 | | 2002 | 4,883 | | 2001 | 4,796 | | 2000 | 4,732 | | 1999 | 4,700 | | 1998 | 4,674 | | 1997 | 4,613 | | 1996 | 4,492 | | 1995 | 4,285 | | 1994 | 4,020 | | 1993 | 3,752 | | 1992 | 3,496 | | 1991 | 3,279 | | 1990 | 3,146 | | 1989 | 3,070 | | 1988 | 3,000 | | 1987 | 2,926 | | 1986 | 2,827 | | 1985 | 2,694 | | 1984 | 2,548 | | 1983 | 2,423 | | 1982 | 2,336 | | 1981 | 2,271 | | 1980 | 2,250 | | 1979 | 2,310 | | 1978 | 2,420 | | 1977 | 2,536 | | 1976 | 2,648 | | 1975 | 2,722 | | 1974 | 2,744 | | 1973 | 2,694 | | 1972 | 2,584 | | 1971 | 2,444 | | 1970 | 2,303 | | 1969 | 2,201 | | 1968 | 2,130 | | 1967 | 2,075 | | 1966 | 2,058 | | 1965 | 2,075 | | 1964 | 2,106 | | 1963 | 2,133 | | 1962 | 2,144 | | 1961 | 2,129 | | 1960 | 2,084 |
|