Year	Cases per 100,000
1990	1.98
1991	1.95
1992	1.92
1993	1.88
1994	1.85
1995	1.82
1996	1.84
1997	1.86
1998	1.88
1999	1.9
2000	1.93
2001	1.91
2002	1.9
2003	1.89
2004	1.88
2005	1.87
2006	1.85
2007	1.84
2008	1.82
2009	1.81
2010	1.8
2011	1.8
2012	1.8
2013	1.81
2014	1.81
2015	1.82
2016	1.83