Year % of new cases 2003 58 2004 22 2005 55 2006 41 2007 66 2008 68 2009 60 2010 70 2011 70 2012 68 2013 71 2014 70 2015 71 2016 70 2017 77 2018 81 2019 81 2020 75 2021 83