Year	Cases per 100,000
1990	24.64
1991	24.3
1992	24.35
1993	24.01
1994	23.81
1995	23.74
1996	23.45
1997	23.34
1998	23.19
1999	23.07
2000	22.59
2001	22.05
2002	21.5
2003	21.07
2004	20.66
2005	20.19
2006	19.81
2007	19.49
2008	19.16
2009	18.92
2010	18.64
2011	18.36
2012	18.12
2013	17.85
2014	17.7
2015	17.55
2016	17.29