Year	per 100,000 population
2000	8.6
2001	8.6
2002	8
2003	7.5
2004	7.7
2005	7.9
2006	8.3
2007	8.3
2008	8.5
2009	8.5
2010	8.4
2011	8.2
2012	7.9
2013	7.5
2014	7
2015	6.5
2016	6
2017	5.6
2018	6
2019	6.4