Year	Cases per 100,000
2000	30
2001	29
2002	27
2003	27
2004	22
2005	18
2006	17
2007	15
2008	14
2009	13
2010	15
2011	13
2012	12
2013	11
2014	8.1
2015	8.8
2016	7.6
2017	6.7
2018	6.2
2019	5.5
2020	4