Year	Cases per 100,000
1990	33.6
1991	33.76
1992	33.95
1993	34.15
1994	34.34
1995	34.56
1996	34.28
1997	34.02
1998	33.76
1999	33.51
2000	33.3
2001	32.6
2002	31.96
2003	31.33
2004	30.72
2005	30.16
2006	29.84
2007	29.51
2008	29.2
2009	28.89
2010	28.61
2011	28.45
2012	28.3
2013	28.16
2014	28.01
2015	27.87
2016	27.75