Year	Cases per 100,000
1990	4.22
1991	4.21
1992	4.2
1993	4.19
1994	4.18
1995	4.17
1996	4.25
1997	4.33
1998	4.41
1999	4.5
2000	4.6
2001	4.55
2002	4.51
2003	4.48
2004	4.45
2005	4.43
2006	4.38
2007	4.35
2008	4.32
2009	4.29
2010	4.28
2011	4.21
2012	4.14
2013	4.08
2014	4.03
2015	3.97
2016	3.92