Year	Cases per 100,000
1990	8.51
1991	8.73
1992	8.95
1993	9.18
1994	9.42
1995	9.67
1996	10.27
1997	10.92
1998	11.6
1999	12.33
2000	13.12
2001	13.68
2002	14.27
2003	14.9
2004	15.55
2005	16.24
2006	16.4
2007	16.56
2008	16.73
2009	16.91
2010	17.1
2011	17.05
2012	17.02
2013	16.99
2014	16.97
2015	16.95
2016	16.95