Year	Cases per 100,000
1990	5.8
1991	5.81
1992	5.82
1993	5.82
1994	5.83
1995	5.85
1996	5.49
1997	5.16
1998	4.85
1999	4.56
2000	4.29
2001	4.18
2002	4.07
2003	3.96
2004	3.86
2005	3.76
2006	3.7
2007	3.64
2008	3.59
2009	3.53
2010	3.48
2011	3.52
2012	3.57
2013	3.61
2014	3.66
2015	3.71
2016	3.76