Year % of new cases 2002 81 2003 81 2004 80 2005 82 2006 79 2007 84 2008 85 2010 28 2011 91 2012 89 2013 84 2014 84 2015 87 2016 89 2017 88 2018 88 2019 91 2020 91 2021 92