Year	Cases per 100,000
1990	7.18
1991	7.3
1992	7.42
1993	7.54
1994	7.67
1995	7.81
1996	7.89
1997	7.98
1998	8.08
1999	8.17
2000	8.28
2001	7.66
2002	7.1
2003	6.58
2004	6.1
2005	5.66
2006	5.4
2007	5.14
2008	4.9
2009	4.68
2010	4.47
2011	4.48
2012	4.49
2013	4.51
2014	4.52
2015	4.54
2016	4.56