Year	Cases per 100,000
1990	22.31
1991	21.58
1992	20.84
1993	19.87
1994	19.05
1995	18.36
1996	17.68
1997	16.97
1998	16.39
1999	15.79
2000	15.19
2001	14.57
2002	13.83
2003	12.91
2004	12.09
2005	11.42
2006	10.82
2007	10.18
2008	9.63
2009	9.28
2010	8.91
2011	9.34
2012	9
2013	8.89
2014	8.8
2015	8.75
2016	8.75