Year	per 100,000 population
2000	16.7
2001	15.8
2002	13.9
2003	12
2004	11.4
2005	10.9
2006	10.5
2007	10.8
2008	9.4
2009	9.4
2010	8.1
2011	8.2
2012	7.2
2013	7
2014	6.7
2015	6.7
2016	5.8
2017	5.5
2018	5.4
2019	5.8