Year	Cases per 100,000
1990	21.75
1991	21.59
1992	21.45
1993	21.27
1994	21.08
1995	20.93
1996	19.76
1997	18.72
1998	18.01
1999	17.31
2000	16.73
2001	16.89
2002	17.14
2003	17.48
2004	17.63
2005	17.67
2006	17.04
2007	16.52
2008	16.05
2009	15.74
2010	15.47
2011	15.32
2012	15.21
2013	15.18
2014	15.22
2015	15.33
2016	15.47