Year	Cases per 100,000
1990	23.58
1991	22.83
1992	22.05
1993	21.7
1994	20.91
1995	19.88
1996	18.78
1997	17.5
1998	17.42
1999	16.9
2000	16.33
2001	16.56
2002	16.53
2003	15.72
2004	15.32
2005	14.83
2006	14.38
2007	14.05
2008	13.93
2009	13.78
2010	13.58
2011	13.73
2012	13.98
2013	13.81
2014	13.55
2015	13.57
2016	13.59