Year	Cases per 100,000
1990	8.77
1991	8.75
1992	8.73
1993	8.71
1994	8.7
1995	8.68
1996	8.72
1997	8.76
1998	8.81
1999	8.85
2000	8.9
2001	8.86
2002	8.82
2003	8.79
2004	8.75
2005	8.72
2006	8.69
2007	8.67
2008	8.64
2009	8.62
2010	8.61
2011	8.57
2012	8.55
2013	8.52
2014	8.49
2015	8.47
2016	8.45