Year	Cases per 100,000
1990	19.84
1991	19.56
1992	19.29
1993	19.02
1994	18.77
1995	18.52
1996	18.55
1997	18.59
1998	18.63
1999	18.67
2000	18.72
2001	18.88
2002	19.05
2003	19.22
2004	19.39
2005	19.57
2006	19.77
2007	19.96
2008	20.16
2009	20.37
2010	20.58
2011	20.85
2012	21.13
2013	21.42
2014	21.71
2015	22.01
2016	22.32