Year	Cases per 100,000
1990	16.65
1991	16.28
1992	15.95
1993	15.71
1994	15.52
1995	15.4
1996	15.07
1997	14.58
1998	14.14
1999	13.56
2000	13.08
2001	12.61
2002	12.12
2003	11.81
2004	11.42
2005	11.03
2006	10.65
2007	10.3
2008	10.02
2009	9.75
2010	9.49
2011	9.28
2012	9.07
2013	8.86
2014	8.67
2015	8.49
2016	8.33