Year	Cases per 100,000
1990	3.29
1991	3.28
1992	3.26
1993	3.26
1994	3.25
1995	3.25
1996	3.24
1997	3.24
1998	3.24
1999	3.18
2000	3.16
2001	3.07
2002	3
2003	2.95
2004	2.91
2005	2.89
2006	2.9
2007	2.9
2008	2.9
2009	2.9
2010	2.9
2011	2.92
2012	2.94
2013	2.97
2014	3.02
2015	3.05
2016	3.11