Year	Cases per 100,000
1990	6.61
1991	6.59
1992	6.57
1993	6.55
1994	6.53
1995	6.51
1996	6.49
1997	6.47
1998	6.46
1999	6.44
2000	6.43
2001	6.39
2002	6.36
2003	6.34
2004	6.31
2005	6.28
2006	6.3
2007	6.31
2008	6.33
2009	6.35
2010	6.38
2011	6.43
2012	6.48
2013	6.53
2014	6.58
2015	6.63
2016	6.68