Year	Cases per 100,000
1990	9.05
1991	8.87
1992	8.79
1993	8.71
1994	8.54
1995	8.47
1996	8.44
1997	8.36
1998	8.29
1999	7.94
2000	7.74
2001	7.46
2002	7.27
2003	7.12
2004	6.8
2005	6.61
2006	6.47
2007	6.37
2008	6.22
2009	6.19
2010	6.24
2011	6.27
2012	6.23
2013	6.07
2014	6.02
2015	5.97
2016	5.92