Year per 100,000 adults 2004 1.8 2005 1.72 2006 1.77 2007 2.045 2008 2.45 2009 2.775 2010 3.185 2011 3.325 2012 3.3449999999999998 2013 3.705 2014 3.55 2015 3.72 2016 4.095000000000001 2017 4.63 2018 4.4399999999999995 2019 4.5 2020 4.5600000000000005 2021 4