Year	Cases per 100,000
1990	5.26
1991	5.16
1992	5.06
1993	4.97
1994	4.88
1995	4.79
1996	4.82
1997	4.86
1998	4.9
1999	4.93
2000	4.98
2001	5.04
2002	5.11
2003	5.18
2004	5.26
2005	5.35
2006	5.26
2007	5.17
2008	5.1
2009	5.03
2010	4.96
2011	4.87
2012	4.8
2013	4.72
2014	4.64
2015	4.57
2016	4.5