Year per 1,000 people 1960 0.91 1965 1.378 1970 1.729 1990 2.538 1991 2.695 1992 2.618 1998 2.433 1999 2.54 2002 2.699 2008 2.879 2009 2.678 2010 2.774 2011 2.895 2012 3.079 2013 3.132 2014 3.204 2015 3.256 2016 2.885 2018 3.859