Year	Cases per 100,000
1990	18.91
1991	19.07
1992	19.61
1993	19.62
1994	19.71
1995	19.36
1996	18.73
1997	18.12
1998	17.49
1999	16.79
2000	16.45
2001	15.93
2002	15.1
2003	14.95
2004	14.77
2005	14.83
2006	14.66
2007	14.26
2008	13.95
2009	13.79
2010	13.55
2011	13.41
2012	13.45
2013	13.48
2014	13.6
2015	13.73
2016	13.82