Year	Cases per 100,000
1990	5.42
1991	5.3
1992	5.06
1993	5.08
1994	4.95
1995	4.93
1996	4.95
1997	4.87
1998	4.81
1999	4.79
2000	4.77
2001	4.75
2002	4.73
2003	4.74
2004	4.82
2005	4.84
2006	4.78
2007	4.56
2008	4.38
2009	4.31
2010	4.23
2011	4.14
2012	4.1
2013	4.02
2014	3.96
2015	3.92
2016	3.88