Year	Cases per 100,000
1990	6.92
1991	6.71
1992	6.48
1993	6.16
1994	5.95
1995	5.79
1996	5.6
1997	5.35
1998	5.18
1999	4.89
2000	4.64
2001	4.41
2002	4.16
2003	3.86
2004	3.57
2005	3.35
2006	3.14
2007	2.87
2008	2.67
2009	2.6
2010	2.55
2011	2.45
2012	2.36
2013	2.35
2014	2.27
2015	2.2
2016	2.16