Year	Cases per 100,000
1990	3.24
1991	3.17
1992	3.1
1993	3.05
1994	2.99
1995	2.95
1996	2.9
1997	2.85
1998	2.81
1999	2.77
2000	2.74
2001	2.71
2002	2.69
2003	2.67
2004	2.66
2005	2.66
2006	2.64
2007	2.62
2008	2.61
2009	2.6
2010	2.58
2011	2.56
2012	2.53
2013	2.5
2014	2.48
2015	2.45
2016	2.42