Year per 1,000 adults 2007 173.52 2008 171.47 2009 171.74 2010 186.2 2011 189.02 2012 420.8 2013 488.97 2014 503.4 2015 542.57 2016 560.28 2017 558.26 2018 542.36 2019 538.04 2020 552.24 2021 555.39