Year	per 100,000 population
2000	8
2001	7.8
2002	7.5
2003	7
2004	6.7
2005	6.3
2006	6
2007	6.4
2008	6.2
2009	6.2
2010	6.3
2011	6.8
2012	6.7
2013	6.6
2014	6.5
2015	6.3
2016	6.2
2017	6
2018	5.7
2019	5.2