Year	per 100,000 population
2000	9.6
2001	8.6
2002	8.9
2003	8.3
2004	7
2005	6.5
2006	5.8
2007	7.7
2008	7.6
2009	5.6
2010	5
2011	4.1
2012	3.1
2013	3.5
2014	3.5
2015	3.5
2016	4
2017	3.3
2018	3.2
2019	3.7