Year	Cases per 100,000
1990	4.76
1991	4.75
1992	4.74
1993	4.74
1994	4.74
1995	4.74
1996	4.64
1997	4.55
1998	4.46
1999	4.37
2000	4.29
2001	4.3
2002	4.32
2003	4.33
2004	4.35
2005	4.37
2006	4.4
2007	4.43
2008	4.46
2009	4.49
2010	4.52
2011	4.53
2012	4.54
2013	4.55
2014	4.56
2015	4.57
2016	4.58