Year	Cases per 100,000
1983	13.64
1984	13.81
1985	17.54
1986	15.98
1987	16.49
1988	16.53
1989	17.87
1990	17.97
1991	17.75
1992	17.51
1993	16.8
1994	16.42
1995	15.92
1996	15.67
1997	15.15
1998	15.05
1999	14.84
2000	14.43
2001	14.5
2002	14.2
2003	13.65
2004	13.08
2005	12.52
2006	12.08
2007	11.68
2008	11.56
2009	11.28
2010	10.98
2011	11.03
2012	11.03
2013	11.03
2014	11.14
2015	11.36
2016	11.48