Year	per 100,000 population
2000	22.5
2001	22.7
2002	22.8
2003	22.7
2004	22.5
2005	22.1
2006	22.2
2007	22.3
2008	22.4
2009	22.5
2010	22.3
2011	22.3
2012	21.4
2013	21.1
2014	21.2
2015	21.2
2016	21.1
2017	21
2018	21
2019	20.9