Year | Value | 2022 | 23,988 | 2021 | 23,738 | 2020 | 23,681 | 2019 | 23,688 | 2018 | 23,763 | 2017 | 23,812 | 2016 | 23,626 | 2015 | 23,507 | 2014 | 23,355 | 2013 | 23,048 | 2012 | 22,583 | 2011 | 21,820 | 2010 | 20,985 | 2009 | 20,239 | 2008 | 19,537 | 2007 | 18,967 | 2006 | 18,420 | 2005 | 17,861 | 2004 | 17,374 | 2003 | 16,867 | 2002 | 16,355 | 2001 | 15,938 | 2000 | 15,714 | 1999 | 15,532 | 1998 | 15,321 | 1997 | 15,138 | 1996 | 14,945 | 1995 | 14,583 | 1994 | 14,011 | 1993 | 13,508 | 1992 | 13,098 | 1991 | 12,603 | 1990 | 12,264 | 1989 | 12,182 | 1988 | 12,018 | 1987 | 11,833 | 1986 | 11,856 | 1985 | 11,938 | 1984 | 11,855 | 1983 | 11,803 | 1982 | 11,875 | 1981 | 12,056 | 1980 | 12,396 | 1979 | 12,797 | 1978 | 13,146 | 1977 | 13,380 | 1976 | 13,350 | 1975 | 12,953 | 1974 | 12,225 | 1973 | 11,423 | 1972 | 10,632 | 1971 | 9,938 | 1970 | 9,596 | 1969 | 9,490 | 1968 | 9,277 | 1967 | 9,043 | 1966 | 8,884 | 1965 | 8,805 | 1964 | 9,036 | 1963 | 9,561 | 1962 | 10,256 | 1961 | 10,901 | 1960 | 11,371 |
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