Year	Cases per 100,000
1990	9.38
1991	9.23
1992	9.07
1993	8.62
1994	8.14
1995	7.67
1996	7.43
1997	7.25
1998	7.17
1999	7.19
2000	7.2
2001	7.05
2002	6.82
2003	6.54
2004	6.29
2005	6.04
2006	5.77
2007	5.57
2008	5.41
2009	5.23
2010	5.12
2011	5.09
2012	5
2013	4.77
2014	4.62
2015	4.57
2016	4.55