Year	per 100,000 population
2000	12.5
2001	12.1
2002	11.3
2003	10.6
2004	10.1
2005	9.4
2006	8.6
2007	6.2
2008	5.5
2009	5.4
2010	5.3
2011	5
2012	4.8
2013	4.5
2014	4.2
2015	4.2
2016	4.1
2017	3.9
2018	3.7
2019	3.6