Year % of new cases 2000 77 2001 74 2002 73 2003 73 2004 77 2005 76 2006 75 2007 75 2008 75 2009 74 2010 73 2011 72 2012 75 2013 75 2014 77 2015 78 2016 78 2017 78 2018 77 2019 78 2020 74 2021 70