Year	Cases per 100,000
1990	25.37
1991	25.55
1992	25.81
1993	25.96
1994	26.06
1995	26.3
1996	26.35
1997	26
1998	25.79
1999	24.62
2000	23.25
2001	21.64
2002	20.17
2003	19.02
2004	18.16
2005	17.23
2006	16.35
2007	15.62
2008	15.02
2009	14.46
2010	14.11
2011	13.82
2012	13.59
2013	13.36
2014	13.25
2015	13.3
2016	13.36