Year	Cases per 100,000
1990	21.87
1991	21.5
1992	21.15
1993	20.44
1994	19.1
1995	18.57
1996	16.94
1997	15.86
1998	14.06
1999	13.18
2000	12.22
2001	12.67
2002	13.56
2003	14.37
2004	14.17
2005	14.29
2006	14.62
2007	14.74
2008	15.31
2009	16.41
2010	16.46
2011	16.63
2012	17.08
2013	16.73
2014	16.99
2015	16.28
2016	15.78