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