Year	per 100,000 population
2000	3.1
2001	3.4
2002	3.6
2003	3.8
2004	4.3
2005	4.5
2006	4.7
2007	4.9
2008	4.7
2009	4.6
2010	4.6
2011	4.5
2012	4.4
2013	4.3
2014	4.2
2015	4.1
2016	4
2017	4
2018	4
2019	4.1