Year | Value | 2022 | 19,631 | 2021 | 19,810 | 2020 | 19,849 | 2019 | 19,592 | 2018 | 19,426 | 2017 | 19,150 | 2016 | 18,375 | 2015 | 17,871 | 2014 | 17,564 | 2013 | 17,167 | 2012 | 16,758 | 2011 | 16,058 | 2010 | 15,354 | 2009 | 15,010 | 2008 | 14,753 | 2007 | 14,505 | 2006 | 14,388 | 2005 | 14,242 | 2004 | 13,889 | 2003 | 13,374 | 2002 | 13,118 | 2001 | 13,071 | 2000 | 12,876 | 1999 | 12,598 | 1998 | 12,383 | 1997 | 12,477 | 1996 | 12,847 | 1995 | 13,149 | 1994 | 13,463 | 1993 | 13,855 | 1992 | 14,177 | 1991 | 14,374 | 1990 | 14,473 | 1989 | 14,666 | 1988 | 14,898 | 1987 | 14,956 | 1986 | 14,885 | 1985 | 14,798 | 1984 | 14,652 | 1983 | 14,507 | 1982 | 14,491 | 1981 | 14,513 | 1980 | 14,495 | 1979 | 14,374 | 1978 | 14,266 | 1977 | 14,251 | 1976 | 14,170 | 1975 | 13,954 | 1974 | 13,490 | 1973 | 12,890 | 1972 | 12,350 | 1971 | 11,837 | 1970 | 11,507 | 1969 | 11,439 | 1968 | 11,417 | 1967 | 11,426 | 1966 | 11,264 | 1965 | 11,109 | 1964 | 11,207 | 1963 | 11,251 | 1962 | 11,174 | 1961 | 11,187 | 1960 | 11,320 |
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