Year	Cases per 100,000
1990	5.84
1991	5.69
1992	5.56
1993	5.31
1994	5.42
1995	5.33
1996	5.03
1997	5
1998	4.91
1999	4.96
2000	5.08
2001	5.04
2002	5.25
2003	5.46
2004	5.75
2005	6.06
2006	6.06
2007	6.07
2008	6.41
2009	6.39
2010	6.44
2011	6.4
2012	6.2
2013	6.19
2014	6.47
2015	6.44
2016	6.41