Year	Cases per 100,000
1990	5.94
1991	6.37
1992	6.83
1993	7.32
1994	7.85
1995	8.42
1996	8.58
1997	8.75
1998	8.91
1999	9.09
2000	9.26
2001	9.14
2002	9.02
2003	8.9
2004	8.78
2005	8.67
2006	8.48
2007	8.3
2008	8.12
2009	7.94
2010	7.78
2011	7.78
2012	7.78
2013	7.78
2014	7.78
2015	7.79
2016	7.79