Year	Cases per 100,000
1990	6.81
1991	6.7
1992	6.99
1993	7.49
1994	7.83
1995	7.72
1996	7.38
1997	7.3
1998	7.35
1999	7.44
2000	7.68
2001	7.57
2002	7.48
2003	7.22
2004	7.02
2005	6.52
2006	6.13
2007	5.71
2008	5.29
2009	5.01
2010	4.79
2011	4.6
2012	4.45
2013	4.37
2014	4.29
2015	4.19
2016	4.12