Year per 100,000 population 2000 20.7 2001 20.6 2002 20.9 2003 22 2004 21.1 2005 19.3 2006 19.6 2007 20.2 2008 21.1 2009 21 2010 20.9 2011 18.5 2012 18.8 2013 18 2014 20.5 2015 20.5 2016 20.4 2017 20.4 2018 27.1 2019 27.3