Year	Cases per 100,000
1990	8.43
1991	8.36
1992	8.3
1993	8.24
1994	8.17
1995	8.12
1996	7.81
1997	7.53
1998	7.26
1999	7
2000	6.76
2001	6.79
2002	6.83
2003	6.86
2004	6.9
2005	6.94
2006	7.18
2007	7.43
2008	7.69
2009	7.96
2010	8.24
2011	8.41
2012	8.59
2013	8.78
2014	8.97
2015	9.16
2016	9.36