Year	Cases per 100,000
1990	17.18
1991	16.47
1992	15.99
1993	15.4
1994	14.98
1995	13.92
1996	14.61
1997	14.51
1998	14.53
1999	13.56
2000	13.1
2001	12.24
2002	11.94
2003	11.97
2004	11.9
2005	11.79
2006	11.53
2007	11.05
2008	11.04
2009	10.69
2010	10.62
2011	10.37
2012	10
2013	10.06
2014	9.96
2015	9.89
2016	9.61