Year Per 100 People 1960 0 1965 0 1970 0 1975 0 1976 0 1977 0 1978 0 1979 0 1980 0 1981 0 1982 0 1983 0 1984 0 1985 0 1986 0 1987 0 1988 0 1989 0 1990 0 1991 0 1992 0 1993 0 1994 0 1995 0.00386 1996 0.0366 1997 0.06743 1998 0.09809 1999 0.20372 2000 0.43072 2001 0.47649 2002 0.71624 2003 1.09522 2004 1.7524 2005 3.22985 2006 4.618 2007 7.59233 2008 10.5645 2009 16.89238 2010 20.55347 2011 25.28582 2012 28.86753 2013 31.91167 2014 32.99881 2015 37.36687 2016 39.67805 2017 41.73805