Year	Cases per 100,000
1990	2.75
1991	2.7
1992	2.66
1993	2.62
1994	2.59
1995	2.56
1996	2.52
1997	2.48
1998	2.44
1999	2.41
2000	2.38
2001	2.33
2002	2.29
2003	2.25
2004	2.21
2005	2.18
2006	2.15
2007	2.13
2008	2.11
2009	2.09
2010	2.07
2011	2.05
2012	2.03
2013	2.02
2014	2
2015	1.99
2016	1.97