Year	Cases per 100,000
1990	7.09
1991	7.06
1992	7.03
1993	7
1994	6.97
1995	6.94
1996	6.87
1997	6.8
1998	6.74
1999	6.67
2000	6.61
2001	6.63
2002	6.66
2003	6.68
2004	6.71
2005	6.74
2006	6.86
2007	6.98
2008	7.11
2009	7.25
2010	7.39
2011	7.55
2012	7.73
2013	7.91
2014	8.1
2015	8.29
2016	8.49