Year	Cases per 100,000
1990	2.61
1991	3.02
1992	3.51
1993	4.07
1994	4.73
1995	5.5
1996	6.02
1997	6.6
1998	7.23
1999	7.93
2000	8.71
2001	8.52
2002	8.35
2003	8.18
2004	8.02
2005	7.86
2006	8.01
2007	8.16
2008	8.32
2009	8.48
2010	8.65
2011	8.62
2012	8.61
2013	8.59
2014	8.58
2015	8.56
2016	8.55