Year	Cases per 100,000
1990	6.17
1991	6.16
1992	6.15
1993	6.16
1994	6.17
1995	6.18
1996	6.29
1997	6.39
1998	6.51
1999	6.67
2000	6.81
2001	6.73
2002	6.62
2003	6.55
2004	6.47
2005	6.38
2006	6.12
2007	5.86
2008	5.66
2009	5.45
2010	5.26
2011	5.24
2012	5.22
2013	5.19
2014	5.16
2015	5.14
2016	5.13