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 1996 0.03968 1997 0.23984 1998 0.67141 1999 1.39945 2000 2.47925 2001 11.79203 2002 19.83099 2003 28.43926 2004 37.22122 2005 42.16196 2006 49.94936 2007 64.92912 2008 84.46798 2009 86.93944 2010 83.5616 2011 85.96907 2012 92.03281 2013 96.76338 2014 97.90202 2015 97.38569 2016 96.79332 2017 98.09148