Year	Cases per 100,000
1990	3.82
1991	3.73
1992	3.65
1993	3.56
1994	3.48
1995	3.4
1996	3.38
1997	3.36
1998	3.34
1999	3.32
2000	3.3
2001	3.18
2002	3.07
2003	2.95
2004	2.85
2005	2.74
2006	2.69
2007	2.64
2008	2.59
2009	2.54
2010	2.49
2011	2.5
2012	2.51
2013	2.53
2014	2.54
2015	2.55
2016	2.56