Year per 1,000 population at risk 2000 1.27717352309064 2001 0.775830276503361 2002 0.543103193229414 2003 0.351886136737964 2004 0.258612251935027 2005 0.4083799932583 2006 0.609789817253335 2007 0.65976544701405 2008 0.313763410581708 2009 0.264027489436695 2010 0.370802642854133 2011 0.146721671313821 2012 0.113401136083666 2013 0.109214043842452 2014 0.157386291230193 2015 0.175649539109056 2016 0.167608746615111 2017 0.120915832042363 2018 0.138497914099779 2019 0.133746356790606 2020 0.0980951898086813 2021 0.075521435546727 2022 0.105318124146358