Year	Cases per 100,000
1990	4.27
1991	4.44
1992	4.63
1993	4.82
1994	5.03
1995	5.25
1996	5.2
1997	5.17
1998	5.13
1999	5.1
2000	5.07
2001	4.89
2002	4.72
2003	4.56
2004	4.4
2005	4.25
2006	4.1
2007	3.96
2008	3.82
2009	3.69
2010	3.56
2011	3.58
2012	3.59
2013	3.61
2014	3.63
2015	3.64
2016	3.66