Year % of people at risk 2003 0.1 2004 0.1 2005 0.1 2006 0.1 2007 0.1 2008 0.1 2009 0.1 2010 0.1 2011 0 2012 0.1 2013 0.1 2014 0.1 2015 0.1 2016 0 2017 0 2018 0 2019 0 2020 0.1 2021 0 2022 0