Year | Value | 2021 | 28,642 | 2020 | 35,894 | 2019 | 27,035 | 2018 | 97,598 | 2017 | 58,880 | 2016 | 24,063 | 2015 | 19,395 | 2014 | 19,560 | 2013 | 30,612 | 2012 | 34,745 | 2011 | 44,126 | 2010 | 45,990 | 2009 | 6,804 | 2008 | 6,952 | 2007 | 6,918 | 2006 | 6,920 | 2005 | 6,255 | 2004 | 5,846 | 2003 | 4,912 | 2002 | 4,324 | 2001 | 12,306 | 2000 | 12,130 | 1999 | 12,000 | 1998 | 28,600 | 1997 | 28,400 | 1996 | 28,400 | 1995 | 27,200 | 1994 | 25,900 | 1993 | 21,800 | 1992 | 22,300 | 1991 | 23,000 | 1990 | 25,800 | 1989 | 25,800 | 1988 | 24,000 | 1987 | 16,600 | 1986 | 20,300 | 1985 | 20,300 | 1984 | 19,500 | 1983 | 16,600 | 1982 | 16,900 | 1981 | 17,000 | 1980 | 17,600 | 1979 | 16,800 | 1978 | 12,900 | 1977 | 12,300 | 1976 | 12,200 | 1975 | 11,800 | 1974 | 12,000 | 1973 | 12,000 | 1972 | 11,400 | 1971 | 11,500 | 1970 | 11,800 |
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