Year	Cases per 100,000
2000	10
2001	10
2002	9.6
2003	10
2004	10
2005	10
2006	10
2007	10
2008	9.7
2009	9.5
2010	8.5
2011	8.5
2012	7.4
2013	7.7
2014	6.4
2015	6.3
2016	6.2
2017	6.3
2018	6.1
2019	5.1
2020	4.6