| Year | Value | | 2022 | 2,946 | | 2021 | 2,959 | | 2020 | 3,002 | | 2019 | 3,069 | | 2018 | 3,141 | | 2017 | 3,193 | | 2016 | 3,208 | | 2015 | 3,187 | | 2014 | 3,133 | | 2013 | 3,058 | | 2012 | 2,970 | | 2011 | 2,878 | | 2010 | 2,786 | | 2009 | 2,688 | | 2008 | 2,577 | | 2007 | 2,457 | | 2006 | 2,340 | | 2005 | 2,222 | | 2004 | 2,107 | | 2003 | 2,000 | | 2002 | 1,910 | | 2001 | 1,835 | | 2000 | 1,766 | | 1999 | 1,706 | | 1998 | 1,657 | | 1997 | 1,608 | | 1996 | 1,559 | | 1995 | 1,525 | | 1994 | 1,510 | | 1993 | 1,507 | | 1992 | 1,512 | | 1991 | 1,522 | | 1990 | 1,515 | | 1989 | 1,494 | | 1988 | 1,479 | | 1987 | 1,472 | | 1986 | 1,471 | | 1985 | 1,474 | | 1984 | 1,476 | | 1983 | 1,476 | | 1982 | 1,474 | | 1981 | 1,470 | | 1980 | 1,477 | | 1979 | 1,496 | | 1978 | 1,516 | | 1977 | 1,533 | | 1976 | 1,548 | | 1975 | 1,561 | | 1974 | 1,567 | | 1973 | 1,571 | | 1972 | 1,571 | | 1971 | 1,569 | | 1970 | 1,565 | | 1969 | 1,559 | | 1968 | 1,552 | | 1967 | 1,543 | | 1966 | 1,531 | | 1965 | 1,516 | | 1964 | 1,499 | | 1963 | 1,481 | | 1962 | 1,464 | | 1961 | 1,446 | | 1960 | 1,430 |
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