Year | Value | 2022 | 20,282 | 2021 | 20,716 | 2020 | 20,638 | 2019 | 19,912 | 2018 | 18,933 | 2017 | 17,931 | 2016 | 17,055 | 2015 | 16,338 | 2014 | 15,691 | 2013 | 15,056 | 2012 | 14,318 | 2011 | 13,392 | 2010 | 12,430 | 2009 | 11,586 | 2008 | 10,885 | 2007 | 10,380 | 2006 | 10,070 | 2005 | 9,869 | 2004 | 9,829 | 2003 | 10,011 | 2002 | 10,445 | 2001 | 11,235 | 2000 | 12,297 | 1999 | 13,332 | 1998 | 14,233 | 1997 | 15,057 | 1996 | 15,845 | 1995 | 16,586 | 1994 | 17,285 | 1993 | 17,910 | 1992 | 18,377 | 1991 | 18,674 | 1990 | 18,748 | 1989 | 18,491 | 1988 | 17,842 | 1987 | 16,823 | 1986 | 15,459 | 1985 | 13,896 | 1984 | 12,359 | 1983 | 10,997 | 1982 | 9,946 | 1981 | 9,289 | 1980 | 9,064 | 1979 | 9,146 | 1978 | 9,267 | 1977 | 9,251 | 1976 | 9,054 | 1975 | 8,783 | 1974 | 8,628 | 1973 | 8,742 | 1972 | 9,231 | 1971 | 10,177 | 1970 | 11,264 | 1969 | 12,137 | 1968 | 12,819 | 1967 | 13,356 | 1966 | 13,780 | 1965 | 14,085 | 1964 | 14,221 | 1963 | 14,133 | 1962 | 13,798 | 1961 | 13,219 | 1960 | 13,092 |
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