Year Per 100 People 2001 0.03115 2002 0.31619 2003 0.50926 2004 2.28113 2005 2.46375 2006 7.59278 2007 10.88977 2008 11.64411 2009 14.60148 2010 15.287 2011 18.19404 2012 17.97532 2013 18.35332 2014 18.89077 2015 18.98733 2016 19.17078 2017 18.47839