Year Cases per 100,000 2000 45 2001 42 2002 45 2003 46 2004 47 2005 43 2006 40 2007 40 2008 40 2009 39 2010 38 2011 39 2012 38 2013 39 2014 37 2015 37 2016 37 2017 39 2018 40 2019 40 2020 35