Year	Cases per 100,000
1990	21.18
1991	20.45
1992	19.83
1993	19.4
1994	19.04
1995	18.57
1996	18.3
1997	18.26
1998	16.73
1999	16.06
2000	15.07
2001	14.13
2002	13.38
2003	12.53
2004	11.75
2005	11.33
2006	10.71
2007	10.2
2008	9.8
2009	9.54
2010	9.4
2011	9.33
2012	9.3
2013	9.15
2014	8.92
2015	8.69
2016	8.58