Year	Cases per 100,000
1990	22.01
1991	21.41
1992	21.28
1993	20.97
1994	20.57
1995	20.01
1996	19.29
1997	18.54
1998	17.86
1999	17.51
2000	17.11
2001	16.84
2002	16.54
2003	16.29
2004	15.27
2005	14.38
2006	14.96
2007	15.33
2008	15.57
2009	15.81
2010	15.67
2011	15.69
2012	15.79
2013	15.86
2014	15.97
2015	16.06
2016	16.14