Year	Cases per 100,000
2000	14
2001	13
2002	11
2003	11
2004	10
2005	9.5
2006	9.1
2007	7.6
2008	7.7
2009	6
2010	5.9
2011	5.4
2012	5.3
2013	4.4
2014	4.5
2015	4.8
2016	4.8
2017	4.7
2018	4.1
2019	4.3
2020	3.4