Year	Cases per 100,000
1990	8.16
1991	7.94
1992	7.84
1993	7.77
1994	7.48
1995	7.35
1996	7
1997	6.72
1998	6.48
1999	6.25
2000	6.28
2001	6.22
2002	6.14
2003	6.13
2004	6.02
2005	5.89
2006	5.8
2007	5.71
2008	5.49
2009	5.27
2010	5.09
2011	5
2012	4.89
2013	4.81
2014	4.76
2015	4.71
2016	4.67