Year	Cases per 100,000
1990	19.74
1991	19.15
1992	19
1993	19.14
1994	18.84
1995	18.98
1996	18.47
1997	17.9
1998	17.44
1999	16.7
2000	15.73
2001	14.59
2002	13.51
2003	12.9
2004	12.24
2005	11.61
2006	11.31
2007	11.13
2008	10.94
2009	10.7
2010	10.42
2011	10.41
2012	10.42
2013	10.45
2014	10.5
2015	10.54
2016	10.59