Year	per 100,000 population
2000	32.3
2001	31.9
2002	31.6
2003	33.5
2004	33.6
2005	33.4
2006	33
2007	32.7
2008	32.3
2009	32
2010	30.5
2011	30.3
2012	29.6
2013	33.3
2014	33.7
2015	34
2016	34.1
2017	35.3
2018	36
2019	37.7