Year	Cases per 100,000
1990	19.32
1991	19.7
1992	19.24
1993	18.73
1994	18.61
1995	18.44
1996	18.12
1997	18.29
1998	17.85
1999	17.54
2000	17.09
2001	16.4
2002	15.83
2003	15.42
2004	15.12
2005	14.94
2006	14.73
2007	14.49
2008	13.97
2009	13.63
2010	12.89
2011	12.53
2012	12.33
2013	11.88
2014	11.39
2015	11.13
2016	10.87