Year	Cases per 100,000
1990	6.41
1991	6.75
1992	7.1
1993	7.36
1994	7.81
1995	8.23
1996	8.53
1997	8.71
1998	8.9
1999	8.85
2000	8.67
2001	8.49
2002	8.22
2003	8.04
2004	7.58
2005	7.25
2006	6.98
2007	6.66
2008	6.3
2009	6.03
2010	5.77
2011	5.52
2012	5.28
2013	5.05
2014	4.81
2015	4.64
2016	4.51