Year	per 100,000 population
2000	5.6
2001	4.9
2002	4.8
2003	4.4
2004	4.1
2005	3.7
2006	3.5
2007	3.2
2008	3
2009	2.6
2010	2.6
2011	2.4
2012	2.3
2013	2.2
2014	2.1
2015	2
2016	1.9
2017	1.8
2018	1.8
2019	1.7