Year	per 100,000 population
2000	2.8
2001	2.5
2002	2.4
2003	2.2
2004	2.1
2005	2.1
2006	2
2007	1.9
2008	1.8
2009	1.7
2010	1.5
2011	1.5
2012	1.4
2013	1.3
2014	1.3
2015	1.2
2016	1.1
2017	1
2018	1
2019	0.9