Year	Cases per 100,000
1990	14.4
1991	14.86
1992	15.65
1993	16.32
1994	17.15
1995	17.92
1996	17.77
1997	17.42
1998	16.43
1999	14.71
2000	13.17
2001	11.78
2002	10.87
2003	10.06
2004	9.45
2005	8.94
2006	8.58
2007	8.28
2008	7.99
2009	7.72
2010	7.49
2011	7.3
2012	7.14
2013	7.02
2014	6.9
2015	6.8
2016	6.74