Year	per 100,000 population
2000	4.4
2001	4.3
2002	4.1
2003	4
2004	4
2005	3.9
2006	4.1
2007	3.9
2008	4.1
2009	4.4
2010	4.3
2011	4.4
2012	4.4
2013	4.3
2014	4.1
2015	3.9
2016	3.9
2017	3.9
2018	3.8
2019	3.7