| Year | Value | | 2022 | 5,823 | | 2021 | 5,803 | | 2020 | 5,798 | | 2019 | 5,684 | | 2018 | 5,571 | | 2017 | 5,473 | | 2016 | 5,381 | | 2015 | 5,286 | | 2014 | 5,188 | | 2013 | 5,087 | | 2012 | 4,980 | | 2011 | 4,868 | | 2010 | 4,751 | | 2009 | 4,625 | | 2008 | 4,485 | | 2007 | 4,346 | | 2006 | 4,236 | | 2005 | 4,169 | | 2004 | 4,143 | | 2003 | 4,160 | | 2002 | 4,199 | | 2001 | 4,209 | | 2000 | 4,155 | | 1999 | 4,044 | | 1998 | 3,876 | | 1997 | 3,660 | | 1996 | 3,436 | | 1995 | 3,232 | | 1994 | 3,042 | | 1993 | 2,858 | | 1992 | 2,680 | | 1991 | 2,507 | | 1990 | 2,337 | | 1989 | 2,177 | | 1988 | 2,039 | | 1987 | 1,918 | | 1986 | 1,817 | | 1985 | 1,741 | | 1984 | 1,696 | | 1983 | 1,690 | | 1982 | 1,716 | | 1981 | 1,746 | | 1980 | 1,750 | | 1979 | 1,718 | | 1978 | 1,646 | | 1977 | 1,545 | | 1976 | 1,451 | | 1975 | 1,391 | | 1974 | 1,368 | | 1973 | 1,382 | | 1972 | 1,426 | | 1971 | 1,477 | | 1970 | 1,511 | | 1969 | 1,528 | | 1968 | 1,534 | | 1967 | 1,525 | | 1966 | 1,509 | | 1965 | 1,494 | | 1964 | 1,476 | | 1963 | 1,451 | | 1962 | 1,421 | | 1961 | 1,391 | | 1960 | 1,363 |
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