Year	per 100,000 population
2000	23.1
2001	21.8
2002	22.4
2003	21.2
2004	21.3
2005	20.1
2006	19.5
2007	18.7
2008	18
2009	19.5
2010	17.2
2011	18
2012	18.2
2013	17.9
2014	17
2015	16.4
2016	15.2
2017	0.6
2018	11.3
2019	11.4