Year	per 100,000 population
2000	19.2
2001	18.8
2002	18.3
2003	18.1
2004	17.5
2005	17
2006	16.4
2007	14.9
2008	14.8
2009	14.8
2010	14.6
2011	14.8
2012	15.9
2013	16
2014	16.1
2015	16.2
2016	16.2
2017	16.3
2018	16.3
2019	16.4