Year	per 100,000 population
2000	3.2
2001	2.9
2002	2.6
2003	2.4
2004	2.2
2005	2.1
2006	2.2
2007	2.1
2008	2
2009	2
2010	2.1
2011	2.1
2012	2
2013	1.8
2014	1.9
2015	1.9
2016	1.8
2017	1.7
2018	1.7
2019	1.6