Year	Cases per 100,000
1990	33.41
1991	32.54
1992	33.31
1993	33.63
1994	32.31
1995	32.73
1996	32.63
1997	32.96
1998	31.98
1999	31.57
2000	30.02
2001	28.63
2002	27.7
2003	27.23
2004	26.24
2005	26.31
2006	25.74
2007	25.68
2008	25.51
2009	25.01
2010	26.08
2011	25.29
2012	24.83
2013	24.55
2014	24.29
2015	24.06
2016	23.84