Year	Cases per 100,000
1990	4.52
1991	4.49
1992	4.46
1993	4.44
1994	4.41
1995	4.39
1996	4.35
1997	4.32
1998	4.28
1999	4.25
2000	4.23
2001	4.19
2002	4.16
2003	4.14
2004	4.11
2005	4.09
2006	4.14
2007	4.19
2008	4.25
2009	4.3
2010	4.36
2011	4.35
2012	4.35
2013	4.35
2014	4.35
2015	4.35
2016	4.35