Year	Cases per 100,000
1983	13.48
1984	13.47
1985	15.02
1986	14.5
1987	15.5
1988	17.6
1989	16.33
1990	16.82
1991	16.38
1992	15.09
1993	14.19
1994	13.7
1995	13.3
1996	12.63
1997	11.9
1998	11.28
1999	10.45
2000	9.7
2001	9.15
2002	8.81
2003	8.41
2004	8.1
2005	7.72
2006	7.38
2007	7.32
2008	7.07
2009	6.89
2010	6.93
2011	6.8
2012	6.59
2013	6.4
2014	6.25
2015	6.28
2016	6.26