Year	Cases per 100,000
1990	24.73
1991	23.99
1992	23.25
1993	22.39
1994	21.32
1995	20.7
1996	20.17
1997	19.4
1998	19.47
1999	18.64
2000	18.06
2001	17.63
2002	17.51
2003	17.67
2004	17.55
2005	17.28
2006	16.69
2007	15.95
2008	15.18
2009	14.56
2010	14.57
2011	14.3
2012	14.25
2013	14.19
2014	14.78
2015	14.8
2016	14.92