Year	per 100,000 population
2000	4
2001	3.6
2002	3.2
2003	3.1
2004	3
2005	2.8
2006	2.7
2007	2.5
2008	2.4
2009	2.4
2010	2.4
2011	2.2
2012	2.2
2013	2.3
2014	2.3
2015	2.3
2016	2.3
2017	2.3
2018	2.3
2019	2.4