Year % of new cases 2000 76 2001 68 2002 81 2003 80 2004 75 2005 74 2006 72 2007 77 2008 71 2009 73 2010 73 2011 75 2012 74 2013 75 2014 75 2015 75 2016 75 2017 75 2018 75 2019 73 2020 71 2021 71