Year % of new cases 2000 75 2001 80 2002 78 2003 82 2004 78 2005 79 2006 83 2007 74 2008 77 2009 76 2010 75 2011 68 2012 75 2013 82 2014 82 2015 79 2016 78 2017 80 2018 84 2019 83 2020 86