Year	per 100,000 population
2000	3.3
2001	3
2002	3.1
2003	3.1
2004	3
2005	3
2006	2.9
2007	2.6
2008	5.3
2009	2.2
2010	2
2011	1.9
2012	1.8
2013	1.8
2014	1.8
2015	1.7
2016	1.7
2017	1.5
2018	1.5
2019	1.3