Year	Cases per 100,000
1990	20.02
1991	20.46
1992	20.91
1993	21.38
1994	21.86
1995	22.36
1996	21.64
1997	20.95
1998	20.3
1999	19.68
2000	19.09
2001	18.1
2002	17.19
2003	16.34
2004	15.55
2005	14.83
2006	14.94
2007	15.04
2008	15.15
2009	15.27
2010	15.39
2011	15.73
2012	16.09
2013	16.46
2014	16.85
2015	17.24
2016	17.66