Year	Cases per 100,000
2000	31
2001	27
2002	26
2003	34
2004	29
2005	31
2006	29
2007	29
2008	27
2009	28
2010	20
2011	18
2012	17
2013	16
2016	11
2017	10
2018	9.8
2019	11
2020	11