Year	Cases per 100,000
1990	30
1991	29.41
1992	28.55
1993	27.92
1994	26.81
1995	25.95
1996	25.15
1997	24.3
1998	24.08
1999	23.28
2000	22.32
2001	21.5
2002	20.98
2003	20.35
2004	19.85
2005	19.42
2006	18.92
2007	18.75
2008	18.44
2009	18.2
2010	18
2011	17.92
2012	17.97
2013	17.94
2014	17.79
2015	17.98
2016	18.18