Year Total 1965 0 1966 0 1967 0 1968 0 1969 0 1970 0 1971 0 1972 0 1973 0 1974 0 1975 0 1976 0 1977 0 1978 0 1979 0 1980 1000 1981 1000 1982 555000 1983 1046000 1984 1693000 1985 1847000 1986 2051000 1987 2184000 1988 2093000 1989 2261000 1990 2370200 1991 2566500 1992 3158800 1993 3568900 1994 3782700 1995 4128900 1996 5005500 1997 5443000 1998 5843000 1999 5738700 2000 6254900 2001 7220000 2002 7632000 2003 7909500 2004 7985700 2005 7939600 2006 7849300 2007 8027500 2008 7899400 2009 7735700 2010 7731700 2011 7932200 2012 8810700 2013 7374500 2014 6876800 2015 6747300 2016 5717700