Year	per 100,000 population
2000	22
2001	22.3
2002	20.9
2003	21.5
2004	20.2
2005	20.7
2006	20.2
2007	18.7
2008	20.3
2009	20.6
2010	20.5
2011	21.1
2012	20.8
2013	19.5
2014	19.4
2015	18.6
2016	19.3
2017	18.9
2018	18.7
2019	18.3