Year	Cases per 100,000
1990	5.95
1991	5.82
1992	5.77
1993	5.89
1994	5.96
1995	6.06
1996	5.91
1997	5.61
1998	5.33
1999	5.14
2000	5.07
2001	4.95
2002	4.86
2003	4.72
2004	4.62
2005	4.48
2006	4.47
2007	4.41
2008	4.43
2009	4.42
2010	4.37
2011	4.24
2012	4.12
2013	4.01
2014	3.9
2015	3.81
2016	3.72