Year	Cases per 100,000
1990	4.6
1991	4.62
1992	4.64
1993	4.65
1994	4.67
1995	4.69
1996	4.7
1997	4.7
1998	4.71
1999	4.71
2000	4.72
2001	4.66
2002	4.6
2003	4.55
2004	4.49
2005	4.44
2006	4.39
2007	4.33
2008	4.28
2009	4.22
2010	4.17
2011	4.18
2012	4.18
2013	4.19
2014	4.2
2015	4.2
2016	4.21