Year	Cases per 100,000
1990	3.54
1991	3.55
1992	3.56
1993	3.56
1994	3.57
1995	3.57
1996	3.53
1997	3.49
1998	3.45
1999	3.41
2000	3.36
2001	3.31
2002	3.27
2003	3.24
2004	3.21
2005	3.18
2006	3.16
2007	3.14
2008	3.13
2009	3.13
2010	3.12
2011	3.16
2012	3.19
2013	3.23
2014	3.27
2015	3.31
2016	3.34