Year	Cases per 100,000
1990	6.8
1991	6.64
1992	6.38
1993	5.96
1994	5.58
1995	5.43
1996	5.13
1997	4.98
1998	5.15
1999	5.41
2000	6.03
2001	6.35
2002	6.81
2003	6.85
2004	6.94
2005	7.02
2006	6.79
2007	6.5
2008	6.17
2009	5.91
2010	5.64
2011	5.29
2012	5.08
2013	4.92
2014	4.74
2015	4.55
2016	4.43