Year	Cases per 100,000
1990	19.99
1991	20.15
1992	20.51
1993	20.81
1994	20.9
1995	20.95
1996	19.73
1997	18.51
1998	17.05
1999	15.38
2000	15.16
2001	14.52
2002	13.94
2003	13.46
2004	13
2005	12.61
2006	12.39
2007	12.34
2008	12.25
2009	12.21
2010	12.14
2011	12.05
2012	11.86
2013	11.57
2014	11.28
2015	11.09
2016	10.91