Year	Cases per 100,000
2000	19
2001	18
2002	17
2003	14
2004	13
2005	13
2006	10
2007	11
2008	10
2009	9.1
2010	8.3
2011	8.8
2012	6.5
2013	6.7
2014	6.9
2015	6.2
2016	5.7
2017	5.4
2018	4.7
2019	4.7
2020	3.6