Year	Cases per 100,000
1990	3.09
1991	3.09
1992	3.09
1993	3.08
1994	3.08
1995	3.08
1996	3.03
1997	2.99
1998	2.95
1999	2.91
2000	2.87
2001	2.84
2002	2.82
2003	2.8
2004	2.77
2005	2.76
2006	2.71
2007	2.67
2008	2.63
2009	2.59
2010	2.55
2011	2.53
2012	2.52
2013	2.51
2014	2.49
2015	2.48
2016	2.47