Year Per 100 People 1960 0.91618 1965 1.22132 1970 1.35654 1975 1.72986 1976 1.70906 1977 1.82301 1978 2.12653 1979 2.35737 1980 2.44578 1981 2.54481 1982 2.95604 1983 3.16183 1984 3.50828 1985 3.89747 1986 4.08764 1987 4.59678 1988 4.80911 1989 5.03016 1990 5.26145 1991 5.99211 1992 7.33382 1993 9.733 1994 11.61823 1995 13.12913 1996 16.10065 1997 19.29982 1998 21.05643 1999 21.87008 2000 23.70048 2001 25.69467 2002 26.44274 2003 28.80097 2004 29.10378 2005 29.25443 2006 29.09703 2007 29.23728 2008 29.33931 2009 30.15697 2010 31.06683 2011 29.94349 2012 27.85289 2013 28.91762 2014 29.60503 2015 30.17176 2016 30.86048 2017 32.65256