Year	Cases per 100,000
1990	4.78
1991	4.64
1992	4.49
1993	4.5
1994	4.45
1995	4.29
1996	4.3
1997	4.27
1998	4.1
1999	3.99
2000	3.83
2001	3.96
2002	3.98
2003	4
2004	3.97
2005	3.95
2006	4.05
2007	4.07
2008	4.22
2009	4.19
2010	4.21
2011	4.02
2012	4.07
2013	3.86
2014	3.84
2015	3.76
2016	3.68