Year % of new cases 2000 86 2002 25 2004 100 2005 86 2006 78 2007 74 2008 88 2009 83 2010 93 2011 83 2012 70 2013 78 2014 47 2015 79 2016 81 2017 68 2018 93 2019 87 2020 77 2021 67