Year	per 100,000 population
2000	34.7
2001	32.2
2002	31.5
2003	29.1
2004	26.8
2005	26.5
2006	23.2
2007	20.9
2008	26.4
2009	26.3
2010	22.5
2011	22.7
2012	23.5
2013	20.6
2014	20.7
2015	21.6
2016	21.3
2017	21.4
2018	18.1
2019	20.1