Year	Cases per 100,000
1990	3.1
1991	3.14
1992	3.18
1993	3.23
1994	3.27
1995	3.32
1996	3.33
1997	3.33
1998	3.34
1999	3.35
2000	3.36
2001	3.44
2002	3.53
2003	3.62
2004	3.71
2005	3.81
2006	3.9
2007	4
2008	4.11
2009	4.21
2010	4.32
2011	4.35
2012	4.38
2013	4.41
2014	4.44
2015	4.48
2016	4.51