Year Cases per 100,000 2000 19 2001 18 2002 19 2003 18 2004 18 2005 16 2006 15 2007 14 2008 14 2009 15 2010 15 2011 14 2012 14 2013 16 2014 14 2015 14 2016 14 2017 17 2018 15 2019 14 2020 8.3