Year	Cases per 100,000
1990	6.1
1991	6.1
1992	6.11
1993	6.12
1994	6.13
1995	6.14
1996	6.1
1997	6.07
1998	6.03
1999	6
2000	5.97
2001	5.98
2002	6.01
2003	6.03
2004	6.05
2005	6.07
2006	6.12
2007	6.17
2008	6.23
2009	6.28
2010	6.34
2011	6.39
2012	6.44
2013	6.49
2014	6.53
2015	6.58
2016	6.64