Year	Cases per 100,000
1990	9.63
1991	9.3
1992	8.99
1993	8.7
1994	8.41
1995	8.14
1996	7.84
1997	7.55
1998	7.28
1999	7.01
2000	6.77
2001	6.57
2002	6.38
2003	6.2
2004	6.03
2005	5.87
2006	5.7
2007	5.53
2008	5.37
2009	5.22
2010	5.08
2011	4.91
2012	4.76
2013	4.61
2014	4.47
2015	4.33
2016	4.2