Year	Cases per 100,000
1990	25.58
1991	25.44
1992	25.23
1993	25.63
1994	25.81
1995	26.11
1996	24.74
1997	24.62
1998	24.35
1999	24.1
2000	23.81
2001	23.46
2002	23.12
2003	22.79
2004	22.4
2005	21.99
2006	21.56
2007	21.18
2008	20.8
2009	20.46
2010	20.14
2011	19.83
2012	19.54
2013	19.28
2014	19.03
2015	18.73
2016	18.45