Year Cases per 100,000 2000 5.5 2001 5.1 2002 5.2 2003 4.8 2004 5.4 2005 5.2 2006 5.7 2007 5.4 2008 5.7 2009 5.9 2010 5.7 2011 5.5 2012 5.7 2013 5.4 2014 5.6 2015 5.2 2016 5.7 2017 5.8 2018 5.8 2019 6 2020 6.3