Year	per 100,000 population
2000	5.4
2001	5.3
2002	5.1
2003	5.1
2004	4.9
2005	4.8
2006	4.6
2007	4.4
2008	3.9
2009	3.4
2010	3.3
2011	3.1
2012	3
2013	2.8
2014	2.6
2015	2.4
2016	2.3
2017	2.1
2018	2
2019	1.9