Year	Cases per 100,000
1990	6.12
1991	6.15
1992	6.18
1993	6.21
1994	6.25
1995	6.29
1996	6.31
1997	6.33
1998	6.36
1999	6.39
2000	6.43
2001	6.41
2002	6.41
2003	6.4
2004	6.39
2005	6.39
2006	6.39
2007	6.38
2008	6.38
2009	6.37
2010	6.38
2011	6.35
2012	6.33
2013	6.32
2014	6.3
2015	6.28
2016	6.27