Year	Cases per 100,000
1990	17.12
1991	16.48
1992	16.38
1993	16.19
1994	16.06
1995	16.22
1996	15.29
1997	14.3
1998	13.45
1999	12.77
2000	12.44
2001	11.93
2002	11.24
2003	10.88
2004	10.54
2005	10.22
2006	9.97
2007	9.76
2008	9.7
2009	9.52
2010	9.24
2011	9.29
2012	9.34
2013	9.42
2014	9.45
2015	9.47
2016	9.51