Year	Cases per 100,000
1990	19.16
1991	18.76
1992	18.37
1993	17.99
1994	17.62
1995	17.26
1996	16.84
1997	16.43
1998	16.03
1999	15.65
2000	15.28
2001	14.88
2002	14.5
2003	14.13
2004	13.78
2005	13.43
2006	13.16
2007	12.88
2008	12.62
2009	12.37
2010	12.13
2011	11.79
2012	11.48
2013	11.17
2014	10.87
2015	10.58
2016	10.31