Year	per 100,000 population
2000	19.9
2001	18.6
2002	19.3
2003	18.2
2004	17.5
2005	17.2
2006	16.4
2007	16
2008	15.8
2009	16
2010	16.1
2011	16.5
2012	16.3
2013	16.2
2014	16.5
2015	16
2016	15.5
2017	15.4
2018	15.7
2019	14.6