Year	Cases per 100,000
1990	16.46
1991	16.21
1992	15.99
1993	15.76
1994	15.44
1995	15.06
1996	14.65
1997	14.37
1998	13.93
1999	13.68
2000	13.37
2001	13.1
2002	13
2003	12.83
2004	12.67
2005	12.52
2006	12.35
2007	12.17
2008	11.99
2009	11.81
2010	11.63
2011	11.45
2012	11.28
2013	11.13
2014	10.98
2015	10.84
2016	10.71