Year	Cases per 100,000
1990	8.87
1991	9.13
1992	9.09
1993	8.97
1994	8.81
1995	8.75
1996	8.5
1997	8.23
1998	7.98
1999	8.1
2000	8.04
2001	7.75
2002	7.22
2003	6.9
2004	6.71
2005	6.37
2006	6.02
2007	5.73
2008	5.58
2009	5.43
2010	5.3
2011	5.13
2012	4.92
2013	4.76
2014	4.86
2015	4.82
2016	4.8