Year Cases per 100,000 2000 43 2001 38 2002 37 2003 38 2004 34 2005 32 2006 30 2007 30 2008 33 2009 31 2010 30 2011 31 2012 43 2013 40 2014 39 2015 39 2016 43 2017 41 2018 40 2019 36 2020 40