Year	Cases per 100,000
1990	4.12
1991	4.15
1992	4.19
1993	4.22
1994	4.26
1995	4.3
1996	4.3
1997	4.3
1998	4.3
1999	4.3
2000	4.3
2001	4.24
2002	4.19
2003	4.13
2004	4.08
2005	4.03
2006	4.03
2007	4.03
2008	4.03
2009	4.03
2010	4.03
2011	4.03
2012	4.03
2013	4.03
2014	4.03
2015	4.03
2016	4.04