Year | Value | 2022 | 15,855 | 2021 | 14,278 | 2020 | 16,232 | 2019 | 21,110 | 2018 | 26,839 | 2017 | 31,527 | 2016 | 34,124 | 2015 | 34,615 | 2014 | 33,425 | 2013 | 31,476 | 2012 | 29,709 | 2011 | 28,619 | 2010 | 28,803 | 2009 | 30,355 | 2008 | 32,455 | 2007 | 34,240 | 2006 | 35,185 | 2005 | 35,138 | 2004 | 34,247 | 2003 | 32,636 | 2002 | 30,657 | 2001 | 28,798 | 2000 | 27,192 | 1999 | 25,521 | 1998 | 23,779 | 1997 | 22,420 | 1996 | 21,652 | 1995 | 21,428 | 1994 | 21,890 | 1993 | 23,311 | 1992 | 25,353 | 1991 | 27,432 | 1990 | 29,358 | 1989 | 30,178 | 1988 | 29,310 | 1987 | 27,672 | 1986 | 25,953 | 1985 | 24,623 | 1984 | 23,830 | 1983 | 23,889 | 1982 | 24,576 | 1981 | 24,990 | 1980 | 24,768 | 1979 | 23,992 | 1978 | 22,671 | 1977 | 20,930 | 1976 | 19,197 | 1975 | 17,767 | 1974 | 16,563 | 1973 | 15,558 | 1972 | 14,884 | 1971 | 14,459 | 1970 | 14,266 | 1969 | 14,353 | 1968 | 14,764 | 1967 | 15,394 | 1966 | 15,989 | 1965 | 16,380 | 1964 | 16,594 | 1963 | 16,527 | 1962 | 16,234 | 1961 | 15,890 | 1960 | 15,516 |
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