Year	Cases per 100,000
1990	24.13
1991	24.25
1992	24.38
1993	24.52
1994	24.65
1995	24.8
1996	24.46
1997	24.15
1998	23.84
1999	23.54
2000	23.26
2001	22.73
2002	22.23
2003	21.75
2004	21.28
2005	20.84
2006	20.63
2007	20.42
2008	20.22
2009	20.02
2010	19.84
2011	19.72
2012	19.61
2013	19.51
2014	19.4
2015	19.3
2016	19.21