Year	per 100,000 population
2000	4.4
2001	4.6
2002	4.3
2003	4.2
2004	4
2005	3.6
2006	3.2
2007	2.8
2008	2.8
2009	2.7
2010	2.6
2011	2.6
2012	2.3
2013	2.2
2014	2
2015	2
2016	1.9
2017	2
2018	1.8
2019	1.9