Year	Cases per 100,000
1990	7.45
1991	7.2
1992	7.02
1993	6.96
1994	6.9
1995	6.92
1996	6.86
1997	6.87
1998	6.83
1999	6.86
2000	6.87
2001	6.87
2002	6.88
2003	6.86
2004	6.84
2005	6.82
2006	6.83
2007	6.69
2008	6.61
2009	6.48
2010	6.37
2011	6.19
2012	6.03
2013	5.92
2014	5.82
2015	5.75
2016	5.68