Year	per 100,000 population
2000	3.4
2001	3.3
2002	3.1
2003	2.9
2004	2.9
2005	3
2006	2.7
2007	2.6
2008	2.4
2009	2.1
2010	2
2011	1.9
2012	1.9
2013	1.9
2014	1.9
2015	2
2016	2
2017	2
2018	2
2019	1.8