Year	Cases per 100,000
1990	22.89
1991	21.98
1992	21.82
1993	21.76
1994	21.76
1995	21.38
1996	20.43
1997	19.35
1998	18.26
1999	17.66
2000	17.06
2001	16.46
2002	16.09
2003	15.81
2004	15.82
2005	15.81
2006	15.63
2007	15.11
2008	14.22
2009	13.58
2010	12.96
2011	12.53
2012	11.89
2013	10.78
2014	10.02
2015	9.57
2016	9.71