Year	Cases per 100,000
1990	15.15
1991	15.75
1992	15.97
1993	16.32
1994	16.83
1995	17.44
1996	17.6
1997	18.25
1998	18.01
1999	17.74
2000	17.81
2001	17.85
2002	17.99
2003	18.28
2004	18.5
2005	18.97
2006	19.51
2007	20.1
2008	20.55
2009	21.26
2010	21.53
2011	21.58
2012	21.75
2013	21.64
2014	21.38
2015	20.77
2016	20.34