Year	Cases per 100,000
1990	19.08
1991	17.39
1992	16.29
1993	15.38
1994	14.33
1995	13.43
1996	12.81
1997	12.27
1998	11.48
1999	11.27
2000	10.96
2001	10.8
2002	10.6
2003	10.37
2004	10.38
2005	10.28
2006	10.09
2007	9.98
2008	9.75
2009	9.51
2010	9.29
2011	9.28
2012	9.23
2013	9.27
2014	9.32
2015	9.37
2016	9.44