| Year | Value | | 2022 | 18,332 | | 2021 | 17,207 | | 2020 | 16,013 | | 2019 | 14,251 | | 2018 | 12,036 | | 2017 | 10,111 | | 2016 | 8,454 | | 2015 | 7,168 | | 2014 | 6,290 | | 2013 | 5,518 | | 2012 | 4,551 | | 2011 | 3,285 | | 2010 | 1,738 | | 2009 | 1,145 | | 2008 | 1,810 | | 2007 | 2,683 | | 2006 | 3,438 | | 2005 | 3,782 | | 2004 | 3,703 | | 2003 | 3,491 | | 2002 | 3,344 | | 2001 | 3,285 | | 2000 | 3,298 | | 1999 | 3,340 | | 1998 | 3,365 | | 1997 | 3,342 | | 1996 | 3,256 | | 1995 | 3,120 | | 1994 | 2,975 | | 1993 | 2,838 | | 1992 | 2,697 | | 1991 | 2,564 | | 1990 | 2,458 | | 1989 | 2,384 | | 1988 | 2,340 | | 1987 | 2,320 | | 1986 | 2,299 | | 1985 | 2,195 | | 1984 | 2,012 | | 1983 | 1,860 | | 1982 | 1,768 | | 1981 | 1,735 | | 1980 | 1,657 | | 1979 | 1,524 | | 1978 | 1,452 | | 1977 | 1,489 | | 1976 | 1,612 | | 1975 | 1,608 | | 1974 | 1,419 | | 1973 | 1,194 | | 1972 | 970 | | 1971 | 778 | | 1970 | 631 | | 1969 | 524 | | 1968 | 447 | | 1967 | 420 | | 1966 | 428 | | 1965 | 436 | | 1964 | 445 | | 1963 | 451 | | 1962 | 457 | | 1961 | 462 | | 1960 | 465 |
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