Year	Cases per 100,000
1990	7.18
1991	6.96
1992	6.75
1993	6.55
1994	6.36
1995	6.17
1996	6.01
1997	5.79
1998	5.58
1999	5.41
2000	5.22
2001	5.08
2002	4.94
2003	4.78
2004	4.61
2005	4.48
2006	4.41
2007	4.28
2008	4.29
2009	4.31
2010	4.34
2011	4.37
2012	4.38
2013	4.39
2014	4.39
2015	4.38
2016	4.34