Year	Cases per 100,000
1990	21.09
1991	20.65
1992	20.65
1993	22.01
1994	22.64
1995	21.52
1996	18.22
1997	17.59
1998	17.76
1999	16.68
2000	15.74
2001	16.41
2002	15.66
2003	15.69
2004	15.5
2005	15.77
2006	16.98
2007	16.72
2008	16.38
2009	16.31
2010	15.88
2011	15.61
2012	14.97
2013	15.5
2014	14.68
2015	14.38
2016	14.31