Year	Cases per 100,000
1990	17.16
1991	16.76
1992	16.48
1993	16.29
1994	16.18
1995	15.95
1996	15.65
1997	15.34
1998	14.96
1999	14.71
2000	14.46
2001	14.24
2002	14.19
2003	14.11
2004	14.11
2005	13.93
2006	13.83
2007	13.77
2008	14.39
2009	14.76
2010	14.99
2011	14.93
2012	14.85
2013	14.92
2014	14.91
2015	14.94
2016	14.99