Year	Cases per 100,000
1990	4.65
1991	4.58
1992	4.51
1993	4.45
1994	4.38
1995	4.33
1996	4.13
1997	3.95
1998	3.77
1999	3.6
2000	3.45
2001	3.38
2002	3.31
2003	3.25
2004	3.19
2005	3.13
2006	3.02
2007	2.92
2008	2.82
2009	2.73
2010	2.64
2011	2.66
2012	2.69
2013	2.71
2014	2.73
2015	2.76
2016	2.78