Year | Value | 2022 | 31,132 | 2021 | 30,914 | 2020 | 31,058 | 2019 | 30,951 | 2018 | 30,468 | 2017 | 29,946 | 2016 | 29,658 | 2015 | 29,594 | 2014 | 29,556 | 2013 | 29,382 | 2012 | 28,993 | 2011 | 28,229 | 2010 | 27,094 | 2009 | 25,871 | 2008 | 24,808 | 2007 | 24,057 | 2006 | 23,563 | 2005 | 23,231 | 2004 | 22,937 | 2003 | 22,533 | 2002 | 21,917 | 2001 | 21,327 | 2000 | 20,403 | 1999 | 19,415 | 1998 | 18,399 | 1997 | 17,434 | 1996 | 16,636 | 1995 | 15,928 | 1994 | 15,462 | 1993 | 15,296 | 1992 | 15,527 | 1991 | 16,075 | 1990 | 16,754 | 1989 | 17,395 | 1988 | 17,765 | 1987 | 17,688 | 1986 | 17,131 | 1985 | 16,206 | 1984 | 15,089 | 1983 | 13,992 | 1982 | 13,069 | 1981 | 12,357 | 1980 | 11,857 | 1979 | 11,490 | 1978 | 11,154 | 1977 | 10,782 | 1976 | 10,361 | 1975 | 9,915 | 1974 | 9,452 | 1973 | 9,004 | 1972 | 8,621 | 1971 | 8,335 | 1970 | 8,165 | 1969 | 8,119 | 1968 | 8,186 | 1967 | 8,361 | 1966 | 8,596 | 1965 | 8,782 | 1964 | 8,882 | 1963 | 8,895 | 1962 | 8,755 | 1961 | 8,467 | 1960 | 8,228 |
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