Year	per 100,000 population
2000	3.6
2001	3.5
2002	3.6
2003	3.7
2004	3.7
2005	3.6
2006	3.6
2007	3.4
2008	3.3
2009	3
2010	3
2011	2.8
2012	2.8
2013	2.6
2014	2.4
2015	2.4
2016	2.2
2017	2.1
2018	2
2019	2