Year	Cases per 100,000
1990	16.49
1991	16.01
1992	15.42
1993	14.8
1994	14.25
1995	13.94
1996	13.23
1997	12.83
1998	12.36
1999	11.86
2000	11.48
2001	11.07
2002	10.61
2003	10.33
2004	10.04
2005	9.79
2006	9.51
2007	9.2
2008	8.95
2009	8.75
2010	8.56
2011	8.36
2012	8.18
2013	8.02
2014	7.89
2015	7.76
2016	7.65