Year	Cases per 100,000
1990	3.28
1991	3.24
1992	3.18
1993	3.13
1994	3.06
1995	3
1996	2.94
1997	2.88
1998	2.83
1999	2.76
2000	2.69
2001	2.61
2002	2.56
2003	2.52
2004	2.48
2005	2.39
2006	2.33
2007	2.28
2008	2.23
2009	2.2
2010	2.21
2011	2.22
2012	2.23
2013	2.28
2014	2.28
2015	2.33
2016	2.36