Year	per 100,000 population
2000	4.5
2001	4.5
2002	4.4
2003	4.1
2004	4
2005	3.9
2006	3.7
2007	3.5
2008	3.4
2009	3.2
2010	3
2011	3
2012	2.9
2013	2.9
2014	2.8
2015	2.7
2016	2.6
2017	2.5
2018	2.5
2019	2.5