Year	Cases per 100,000
1990	8.46
1991	8.13
1992	8.29
1993	7.92
1994	7.93
1995	7.48
1996	7.08
1997	6.71
1998	6.55
1999	6.47
2000	6.14
2001	5.77
2002	5.58
2003	5.13
2004	5
2005	4.81
2006	4.51
2007	4.11
2008	4.27
2009	4.19
2010	3.9
2011	4.07
2012	4.1
2013	4.12
2014	4.14
2015	4.16
2016	4.17