Year	Cases per 100,000
1990	16.22
1991	15.99
1992	16.61
1993	19.01
1994	20.26
1995	19.11
1996	17.52
1997	16.27
1998	15.87
1999	16.65
2000	16.93
2001	16.93
2002	17.16
2003	17.51
2004	17.51
2005	17.84
2006	17.08
2007	16.95
2008	17.21
2009	16.76
2010	16.87
2011	16.65
2012	16.3
2013	16.15
2014	16.08
2015	15.89
2016	16.01