Year	Cases per 100,000
1990	4.68
1991	4.71
1992	4.72
1993	4.74
1994	4.7
1995	4.73
1996	4.69
1997	4.65
1998	4.58
1999	4.46
2000	4.38
2001	4.28
2002	4.31
2003	4.16
2004	4.04
2005	3.89
2006	3.75
2007	3.64
2008	3.46
2009	3.31
2010	3.16
2011	3.02
2012	2.92
2013	2.86
2014	2.81
2015	2.79
2016	2.79