Year	Cases per 100,000
1990	22.7
1991	21.96
1992	21.14
1993	20.38
1994	19.6
1995	19.22
1996	18.32
1997	17.69
1998	17.15
1999	16.13
2000	15.61
2001	14.94
2002	14.36
2003	13.89
2004	13.17
2005	12.73
2006	12.31
2007	12.08
2008	11.89
2009	11.77
2010	11.44
2011	11.32
2012	11.31
2013	11.39
2014	11.06
2015	11.12
2016	11.23