Year	Cases per 100,000
1990	20.12
1991	20.32
1992	20.45
1993	20.37
1994	20.54
1995	20.91
1996	21.21
1997	21.59
1998	21.99
1999	22.02
2000	22.02
2001	21.71
2002	21.85
2003	21.84
2004	21.61
2005	21.34
2006	20.96
2007	20.48
2008	20.19
2009	19.84
2010	19.32
2011	18.86
2012	18.55
2013	18.35
2014	18.22
2015	18.1
2016	18.02