Year	Cases per 100,000
1990	10.38
1991	10
1992	9.61
1993	9.74
1994	9.97
1995	10.15
1996	10.4
1997	10.12
1998	9.98
1999	9.67
2000	9.24
2001	8.73
2002	8.24
2003	8.03
2004	7.88
2005	7.74
2006	7.53
2007	7.4
2008	7.28
2009	7.02
2010	6.86
2011	6.65
2012	6.42
2013	6.29
2014	6.16
2015	6.05
2016	5.93