Year	Cases per 100,000
1990	7.61
1991	7.44
1992	7.35
1993	7.18
1994	6.93
1995	6.74
1996	6.5
1997	6.33
1998	6.17
1999	5.92
2000	5.73
2001	5.55
2002	5.47
2003	5.39
2004	5.22
2005	5.03
2006	4.94
2007	4.8
2008	4.68
2009	4.57
2010	4.46
2011	4.39
2012	4.53
2013	4.55
2014	4.56
2015	4.62
2016	4.65