Year	Cases per 100,000
1990	6.78
1991	6.59
1992	6.41
1993	6.24
1994	6.07
1995	5.91
1996	5.63
1997	5.36
1998	5.11
1999	4.87
2000	4.64
2001	4.56
2002	4.49
2003	4.41
2004	4.34
2005	4.27
2006	4.24
2007	4.21
2008	4.18
2009	4.16
2010	4.14
2011	4.15
2012	4.17
2013	4.18
2014	4.2
2015	4.22
2016	4.24