Year	per 100,000 population
2000	1.2
2001	1.2
2002	1.1
2003	1.1
2004	1
2005	0.9
2006	0.8
2007	0.8
2008	0.7
2009	0.6
2010	0.6
2011	0.5
2012	0.5
2013	0.4
2014	0.4
2015	0.4
2016	0.4
2017	0.4
2018	0.4
2019	0.5