Year % of new cases 2000 78 2001 81 2002 87 2003 88 2004 88 2005 89 2006 88 2007 88 2008 87 2009 90 2010 91 2011 84 2012 53 2013 80 2014 70 2015 91 2016 90 2017 86 2018 89 2019 89 2020 91 2021 96