Year	Cases per 100,000
1990	19.88
1991	19.97
1992	20.08
1993	20.18
1994	20.29
1995	20.41
1996	20.32
1997	20.24
1998	20.17
1999	20.1
2000	20.04
2001	20.02
2002	20.01
2003	20
2004	20
2005	20.01
2006	20.57
2007	21.13
2008	21.72
2009	22.33
2010	22.97
2011	23.37
2012	23.79
2013	24.22
2014	24.65
2015	25.1
2016	25.55