Year | Value | 2022 | 17,860 | 2021 | 17,850 | 2020 | 17,786 | 2019 | 17,742 | 2018 | 17,772 | 2017 | 17,857 | 2016 | 18,020 | 2015 | 18,314 | 2014 | 18,761 | 2013 | 19,354 | 2012 | 20,027 | 2011 | 20,674 | 2010 | 21,119 | 2009 | 21,293 | 2008 | 21,260 | 2007 | 21,039 | 2006 | 20,659 | 2005 | 20,132 | 2004 | 19,453 | 2003 | 18,637 | 2002 | 17,728 | 2001 | 16,808 | 2000 | 15,952 | 1999 | 15,184 | 1998 | 14,521 | 1997 | 13,992 | 1996 | 13,606 | 1995 | 13,362 | 1994 | 13,285 | 1993 | 13,376 | 1992 | 13,591 | 1991 | 13,804 | 1990 | 13,851 | 1989 | 13,724 | 1988 | 13,540 | 1987 | 13,384 | 1986 | 13,311 | 1985 | 13,324 | 1984 | 13,355 | 1983 | 13,313 | 1982 | 13,157 | 1981 | 12,824 | 1980 | 12,278 | 1979 | 11,619 | 1978 | 10,961 | 1977 | 10,349 | 1976 | 9,799 | 1975 | 9,311 | 1974 | 8,861 | 1973 | 8,421 | 1972 | 7,978 | 1971 | 7,476 | 1970 | 6,870 | 1969 | 6,230 | 1968 | 5,638 | 1967 | 5,130 | 1966 | 4,718 | 1965 | 4,395 | 1964 | 4,153 | 1963 | 3,965 | 1962 | 3,802 | 1961 | 3,653 | 1960 | 3,528 |
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