Year	per 100,000 population
2000	9.9
2001	9.3
2002	9.1
2003	8.5
2004	8.2
2005	8.3
2006	8
2007	7.9
2008	7.1
2009	7.1
2010	6.5
2011	5.9
2012	5.8
2013	5.3
2014	5.4
2015	5.2
2016	5.6
2017	5.2
2018	4.8
2019	4.9