Year	per 100,000 population
2000	1.5
2001	1.4
2002	1.4
2003	1.3
2004	1.2
2005	1.1
2006	1.1
2007	1
2008	1.1
2009	1.1
2010	1
2011	1
2012	0.9
2013	0.9
2014	0.7
2015	0.6
2016	0.6
2017	0.6
2018	0.6
2019	0.6