Year	Cases per 100,000
1990	18.13
1991	18.17
1992	18.33
1993	18.72
1994	19.24
1995	19.81
1996	19.99
1997	19.92
1998	19.89
1999	19.89
2000	19.78
2001	19.67
2002	19.6
2003	19.38
2004	19.09
2005	18.61
2006	18.03
2007	17.56
2008	17.19
2009	16.96
2010	16.67
2011	16.33
2012	16.01
2013	15.57
2014	15.33
2015	14.86
2016	14.51