Year Cases per 100,000 2000 25 2001 25 2002 26 2003 23 2004 23 2005 30 2006 27 2007 27 2008 28 2009 27 2010 27 2011 31 2012 33 2013 35 2014 35 2015 39 2016 48 2017 57 2018 56 2019 47 2020 31