Year Cases per 100,000 2000 25 2001 23 2002 34 2003 12 2004 21 2005 16 2008 6.6 2009 17 2010 19 2011 23 2012 22 2013 26 2014 14 2015 8.4 2016 13 2017 17 2018 15 2019 14 2020 9.2