Year	per 100,000 population
2000	27.6
2001	27.7
2002	28
2003	28.4
2004	29.1
2005	29.2
2006	29.4
2007	29.6
2008	29.7
2009	29.4
2010	30.2
2011	30
2012	29.6
2013	29.8
2014	30.2
2015	30.4
2016	30.5
2017	30.7
2018	30.8
2019	31