Year Cases per 100,000 2000 19 2001 21 2002 16 2003 19 2004 22 2005 19 2006 17 2007 18 2008 21 2009 21 2010 21 2011 24 2012 24 2013 26 2014 25 2015 26 2016 26 2017 27 2018 29 2019 31 2020 28