Year	Cases per 100,000
1990	7.87
1991	7.65
1992	7.44
1993	7.24
1994	7.04
1995	6.85
1996	6.6
1997	6.36
1998	6.13
1999	5.91
2000	5.7
2001	5.6
2002	5.51
2003	5.41
2004	5.32
2005	5.24
2006	5.28
2007	5.32
2008	5.37
2009	5.42
2010	5.47
2011	5.5
2012	5.54
2013	5.58
2014	5.62
2015	5.66
2016	5.71