Year	Cases per 100,000
1990	35.42
1991	36.04
1992	36.15
1993	36.32
1994	36.03
1995	35.55
1996	34.95
1997	34.27
1998	33.12
1999	31.87
2000	31.09
2001	30.72
2002	30.33
2003	29.83
2004	29.23
2005	28.42
2006	27.65
2007	27.08
2008	26.75
2009	26.83
2010	26.72
2011	26.53
2012	26.24
2013	25.96
2014	25.76
2015	25.46
2016	25.09