Year Cases per 100,000 2000 10 2001 9.8 2002 9.5 2003 10 2004 8.4 2005 8.2 2006 8.1 2007 8.8 2008 8.7 2009 7.9 2010 7.6 2011 7.5 2012 7.4 2013 7.4 2014 7.1 2015 7 2016 7.2 2017 7.5 2018 7.4 2019 7.5 2020 6.7