Year	per 100,000 population
2000	31.1
2001	30.7
2002	30.2
2003	30.3
2004	30.6
2005	30.7
2006	30.7
2007	31.1
2008	30.7
2009	30.6
2010	31
2011	30.6
2012	29.4
2013	29.5
2014	29.8
2015	29.9
2016	29.7
2017	29.8
2018	29.7
2019	29.7