Year	Cases per 100,000
1990	3.15
1991	3.11
1992	3.07
1993	3.04
1994	3
1995	2.97
1996	2.92
1997	2.88
1998	2.84
1999	2.81
2000	2.78
2001	2.74
2002	2.71
2003	2.67
2004	2.64
2005	2.61
2006	2.63
2007	2.65
2008	2.68
2009	2.7
2010	2.73
2011	2.74
2012	2.75
2013	2.76
2014	2.76
2015	2.77
2016	2.78