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