Year	Cases per 100,000
1990	9.94
1991	9.66
1992	9.32
1993	9.19
1994	8.74
1995	8.17
1996	7.73
1997	7.24
1998	7
1999	6.61
2000	6.36
2001	6.11
2002	5.89
2003	5.6
2004	5.36
2005	5.16
2006	5.12
2007	5.02
2008	4.88
2009	4.76
2010	4.72
2011	4.6
2012	4.43
2013	4.31
2014	4.17
2015	4.15
2016	4.16