Year	Cases per 100,000
1990	10.86
1991	10.87
1992	10.9
1993	10.92
1994	10.94
1995	10.97
1996	10.61
1997	10.27
1998	9.94
1999	9.62
2000	9.32
2001	8.98
2002	8.67
2003	8.36
2004	8.07
2005	7.78
2006	7.7
2007	7.62
2008	7.55
2009	7.47
2010	7.4
2011	7.47
2012	7.55
2013	7.62
2014	7.7
2015	7.78
2016	7.86