Year	Cases per 100,000
1990	3.6
1991	3.55
1992	3.51
1993	3.47
1994	3.44
1995	3.4
1996	3.35
1997	3.31
1998	3.28
1999	3.3
2000	3.31
2001	3.34
2002	3.37
2003	3.39
2004	3.41
2005	3.43
2006	3.54
2007	3.65
2008	3.77
2009	3.89
2010	4.01
2011	4.1
2012	4.19
2013	4.28
2014	4.37
2015	4.47
2016	4.57