| Year | Value | | 2022 | 5,797 | | 2021 | 5,555 | | 2020 | 5,425 | | 2019 | 5,316 | | 2018 | 5,205 | | 2017 | 5,086 | | 2016 | 5,022 | | 2015 | 4,988 | | 2014 | 4,908 | | 2013 | 4,822 | | 2012 | 4,691 | | 2011 | 4,503 | | 2010 | 4,334 | | 2009 | 4,180 | | 2008 | 4,007 | | 2007 | 3,846 | | 2006 | 3,709 | | 2005 | 3,581 | | 2004 | 3,472 | | 2003 | 3,358 | | 2002 | 3,234 | | 2001 | 3,088 | | 2000 | 2,929 | | 1999 | 2,838 | | 1998 | 2,798 | | 1997 | 2,743 | | 1996 | 2,704 | | 1995 | 2,685 | | 1994 | 2,649 | | 1993 | 2,589 | | 1992 | 2,534 | | 1991 | 2,511 | | 1990 | 2,485 | | 1989 | 2,448 | | 1988 | 2,415 | | 1987 | 2,404 | | 1986 | 2,368 | | 1985 | 2,316 | | 1984 | 2,245 | | 1983 | 2,147 | | 1982 | 2,080 | | 1981 | 2,042 | | 1980 | 2,020 | | 1979 | 1,994 | | 1978 | 1,940 | | 1977 | 1,855 | | 1976 | 1,748 | | 1975 | 1,646 | | 1974 | 1,564 | | 1973 | 1,481 | | 1972 | 1,409 | | 1971 | 1,339 | | 1970 | 1,272 | | 1969 | 1,212 | | 1968 | 1,154 | | 1967 | 1,111 | | 1966 | 1,081 | | 1965 | 1,049 | | 1964 | 1,026 | | 1963 | 1,017 | | 1962 | 1,001 | | 1961 | 977 | | 1960 | 959 |
|