Year	Cases per 100,000
1990	15.5
1991	15.3
1992	14.7
1993	14.9
1994	14.65
1995	14.52
1996	14.04
1997	14.05
1998	13.89
1999	13.37
2000	13.3
2001	12.75
2002	12.42
2003	12
2004	11.73
2005	11.55
2006	11.36
2007	11.17
2008	10.97
2009	10.75
2010	10.52
2011	10.29
2012	10.06
2013	9.88
2014	9.69
2015	9.51
2016	9.36