Year	Cases per 100,000
1990	7.62
1991	7.69
1992	7.46
1993	7.47
1994	7.26
1995	7.22
1996	6.89
1997	6.65
1998	6.42
1999	6.52
2000	5.75
2001	5.4
2002	5.21
2003	5.29
2004	4.92
2005	4.84
2006	4.61
2007	4.27
2008	4.05
2009	4.21
2010	4.17
2011	4.12
2012	4.03
2013	4.06
2014	4.01
2015	3.96
2016	3.92