Year	per 100,000 population
2000	2
2001	2.1
2002	2.1
2003	2.2
2004	2.1
2005	2.1
2006	2
2007	2.1
2008	2.2
2009	2.2
2010	2
2011	1.8
2012	1.9
2013	1.9
2014	1.9
2015	1.9
2016	1.9
2017	1.8
2018	1.7
2019	1.7