Year	Cases per 100,000
1990	19.75
1991	19.57
1992	19.44
1993	19.35
1994	19.41
1995	19.61
1996	19.94
1997	20.32
1998	20.72
1999	21.09
2000	21.41
2001	21.66
2002	21.82
2003	21.88
2004	21.83
2005	21.73
2006	21.58
2007	21.41
2008	21.25
2009	21.13
2010	20.98
2011	20.78
2012	20.58
2013	20.39
2014	20.18
2015	19.98
2016	19.79