Year	per 100,000 population
2000	19.7
2001	20.1
2002	21.2
2003	21
2004	22.2
2005	22.4
2006	21.8
2007	22.5
2008	22.6
2009	22.2
2010	24.3
2011	24.5
2012	24.8
2013	23.1
2014	23.6
2015	20.8
2016	19.9
2017	18.7
2018	17.1
2019	16