Year	Cases per 100,000
1990	20.93
1991	20.87
1992	20.83
1993	20.78
1994	20.75
1995	20.72
1996	20.62
1997	20.53
1998	20.44
1999	20.35
2000	20.28
2001	19.91
2002	19.57
2003	19.24
2004	18.92
2005	18.62
2006	18.23
2007	17.89
2008	17.57
2009	17.27
2010	17
2011	17.47
2012	17.98
2013	18.52
2014	19.1
2015	19.73
2016	20.43