Year	Cases per 100,000
1990	8.65
1991	8.38
1992	8.13
1993	7.88
1994	7.65
1995	7.42
1996	7.23
1997	7.05
1998	6.88
1999	6.72
2000	6.56
2001	6.62
2002	6.69
2003	6.76
2004	6.84
2005	6.92
2006	6.91
2007	6.9
2008	6.9
2009	6.89
2010	6.89
2011	6.81
2012	6.74
2013	6.66
2014	6.59
2015	6.52
2016	6.45