Year	Cases per 100,000
1990	5.49
1991	5.38
1992	5.38
1993	5.38
1994	5.23
1995	5.21
1996	5.17
1997	4.93
1998	4.8
1999	4.63
2000	4.45
2001	4.47
2002	4.13
2003	3.9
2004	3.79
2005	3.79
2006	3.84
2007	3.88
2008	3.91
2009	3.91
2010	4.02
2011	4.05
2012	4.01
2013	4.01
2014	4.1
2015	4.06
2016	4.05