Year	Cases per 100,000
1990	8.87
1991	8.6
1992	8.34
1993	8.1
1994	7.86
1995	7.63
1996	6.89
1997	6.21
1998	5.61
1999	5.06
2000	4.57
2001	4.38
2002	4.19
2003	4.02
2004	3.85
2005	3.69
2006	3.79
2007	3.89
2008	3.99
2009	4.1
2010	4.21
2011	4.25
2012	4.3
2013	4.35
2014	4.4
2015	4.45
2016	4.5