Year	Cases per 100,000
1990	4.9
1991	4.91
1992	4.92
1993	4.94
1994	4.95
1995	4.96
1996	4.84
1997	4.73
1998	4.62
1999	4.51
2000	4.4
2001	4.29
2002	4.18
2003	4.07
2004	3.97
2005	3.88
2006	3.75
2007	3.62
2008	3.5
2009	3.39
2010	3.28
2011	3.22
2012	3.16
2013	3.1
2014	3.05
2015	2.99
2016	2.94