Year	Cases per 100,000
1990	9.61
1991	9.7
1992	9.41
1993	9.04
1994	8.66
1995	8.54
1996	8.16
1997	7.79
1998	7.5
1999	7.31
2000	6.97
2001	7.01
2002	7.06
2003	7.05
2004	6.87
2005	6.56
2006	6.29
2007	5.9
2008	5.67
2009	5.52
2010	5.44
2011	5.32
2012	5.21
2013	5.04
2014	4.98
2015	4.91
2016	4.85