Year	Cases per 100,000
1990	26.15
1991	26.22
1992	26.23
1993	26.26
1994	26.39
1995	26.36
1996	26.09
1997	24.79
1998	23.95
1999	23.64
2000	23.4
2001	22.9
2002	22.86
2003	22.82
2004	22.28
2005	21.85
2006	21.53
2007	20.79
2008	20.11
2009	19.55
2010	19.05
2011	18.76
2012	18.4
2013	17.98
2014	17.66
2015	17.54
2016	17.36