Year	Cases per 100,000
1990	6.98
1991	6.9
1992	6.83
1993	6.75
1994	6.68
1995	6.62
1996	6.49
1997	6.36
1998	6.24
1999	6.12
2000	6
2001	5.96
2002	5.92
2003	5.88
2004	5.85
2005	5.82
2006	5.71
2007	5.61
2008	5.51
2009	5.42
2010	5.33
2011	5.31
2012	5.3
2013	5.29
2014	5.27
2015	5.26
2016	5.26