Year	Cases per 100,000
1990	1.31
1991	1.31
1992	1.3
1993	1.3
1994	1.3
1995	1.3
1996	1.3
1997	1.29
1998	1.29
1999	1.28
2000	1.28
2001	1.28
2002	1.28
2003	1.28
2004	1.28
2005	1.28
2006	1.28
2007	1.28
2008	1.28
2009	1.28
2010	1.29
2011	1.28
2012	1.27
2013	1.27
2014	1.27
2015	1.26
2016	1.26