Year	per 100,000 population
2000	3.4
2001	3
2002	2.4
2003	3.1
2004	3.2
2005	3.1
2006	3
2007	2.9
2008	2.8
2009	2.6
2010	2.5
2011	2.5
2012	2.4
2013	2.3
2014	2.3
2015	2.3
2016	2.2
2017	2.1
2018	2
2019	1.9