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 1986 0.06742 1987 0.10536 1988 0.16034 1989 0.22479 1990 0.4802 1991 0.70159 1992 1.05494 1993 1.74415 1994 2.86047 1995 4.90381 1996 7.23159 1997 9.27415 1998 9.94869 1999 13.19722 2000 22.0902 2001 31.16177 2002 37.41093 2003 45.05704 2004 58.03979 2005 76.17094 2006 74.44938 2007 87.68548 2008 102.22024 2009 109.19609 2010 120.44092 2011 128.02911 2012 141.66628 2013 144.76521 2014 148.63231 2015 143.55297 2016 139.36778 2017 133.8798