Year	Cases per 100,000
1990	11.22
1991	10.77
1992	9.77
1993	8.97
1994	8.29
1995	7.72
1996	7.61
1997	7.43
1998	7.24
1999	7.1
2000	6.97
2001	7.23
2002	7.45
2003	7.64
2004	7.83
2005	7.9
2006	7.62
2007	7.36
2008	7.12
2009	6.92
2010	6.74
2011	6.41
2012	6.15
2013	5.93
2014	5.74
2015	5.56
2016	5.39