Year	Cases per 100,000
1990	24.59
1991	24.3
1992	24.05
1993	23.8
1994	23.55
1995	23.33
1996	22.94
1997	22.57
1998	22.21
1999	21.86
2000	21.53
2001	21.27
2002	21.02
2003	20.78
2004	20.54
2005	20.31
2006	20.21
2007	20.09
2008	19.99
2009	19.89
2010	19.8
2011	19.8
2012	19.81
2013	19.82
2014	19.83
2015	19.84
2016	19.87