Year	Cases per 100,000
1990	3.12
1991	3.14
1992	3.16
1993	3.18
1994	3.19
1995	3.21
1996	3.19
1997	3.17
1998	3.15
1999	3.14
2000	3.11
2001	3.18
2002	3.24
2003	3.3
2004	3.37
2005	3.31
2006	3.33
2007	3.35
2008	3.38
2009	3.41
2010	3.44
2011	3.49
2012	3.53
2013	3.58
2014	3.63
2015	3.68
2016	3.73