Year	Cases per 100,000
1990	6.28
1991	6.05
1992	5.83
1993	5.63
1994	5.43
1995	5.24
1996	4.85
1997	4.48
1998	4.15
1999	3.84
2000	3.56
2001	3.39
2002	3.23
2003	3.08
2004	2.94
2005	2.8
2006	2.81
2007	2.82
2008	2.83
2009	2.84
2010	2.85
2011	2.89
2012	2.93
2013	2.97
2014	3.01
2015	3.06
2016	3.1