Year	Cases per 100,000
1990	6.87
1991	6.41
1992	6.17
1993	6.52
1994	6.4
1995	6.45
1996	6.48
1997	6.18
1998	5.89
1999	5.64
2000	5.38
2001	5.13
2002	4.94
2003	4.85
2004	4.91
2005	5
2006	4.86
2007	4.76
2008	4.69
2009	4.47
2010	4.29
2011	4.16
2012	4.09
2013	4.02
2014	3.99
2015	4.02
2016	4.08