Year	Cases per 100,000
2000	19
2001	18
2002	18
2003	18
2004	12
2005	13
2006	12
2007	12
2008	11
2009	8.4
2010	7.6
2011	7
2012	5.9
2013	7.3
2014	5.9
2015	5.7
2016	5.2
2017	4.2
2018	5
2019	3.9
2020	2.8