Year	Cases per 100,000
1990	4.5
1991	4.46
1992	4.43
1993	4.4
1994	4.36
1995	4.33
1996	4.31
1997	4.28
1998	4.26
1999	4.24
2000	4.22
2001	4.16
2002	4.11
2003	4.05
2004	4
2005	3.95
2006	3.9
2007	3.85
2008	3.8
2009	3.75
2010	3.71
2011	3.71
2012	3.72
2013	3.73
2014	3.74
2015	3.75
2016	3.76