Year	per 100,000 population
2000	19.9
2001	18.2
2002	16.4
2003	15.8
2004	17.5
2005	16.6
2006	16
2007	16.1
2008	15.5
2009	14.9
2010	13.1
2011	12.3
2012	11.3
2013	10.3
2014	9.3
2015	9.3
2016	9.7
2017	8.6
2018	8.3
2019	8.3