Year	Cases per 100,000
1990	15.11
1991	15.79
1992	16.53
1993	17.32
1994	18.16
1995	19.06
1996	18.97
1997	18.88
1998	18.79
1999	18.7
2000	18.61
2001	18.36
2002	18.11
2003	17.86
2004	17.62
2005	17.39
2006	17.37
2007	17.35
2008	17.33
2009	17.31
2010	17.3
2011	17.39
2012	17.48
2013	17.58
2014	17.68
2015	17.78
2016	17.89