Year	per 100,000 population
2000	29.9
2001	29.9
2002	29.6
2003	30
2004	30.4
2005	29.9
2006	28.6
2007	28.8
2008	29
2009	29.7
2010	30.1
2011	31
2012	30.5
2013	30.7
2014	31.1
2015	31.5
2016	32.4
2017	32.6
2018	33
2019	33.5