Year	Cases per 100,000
1990	21.79
1991	21.65
1992	21.57
1993	21.44
1994	21.38
1995	21.31
1996	20.77
1997	20.03
1998	19.4
1999	19.03
2000	18.72
2001	18.19
2002	17.58
2003	16.94
2004	16.26
2005	15.8
2006	15.4
2007	14.93
2008	14.74
2009	14.78
2010	14.9
2011	15.28
2012	15.49
2013	15.69
2014	16.02
2015	16.62
2016	17.34