Year	Cases per 100,000
1990	33.17
1991	32.18
1992	31.04
1993	30.46
1994	29.24
1995	27.77
1996	26.04
1997	24.18
1998	22.75
1999	21.46
2000	20.09
2001	19.23
2002	18.52
2003	17.85
2004	17.38
2005	16.93
2006	16.51
2007	16.1
2008	15.71
2009	15.35
2010	15.01
2011	14.67
2012	14.37
2013	14.06
2014	13.78
2015	13.52
2016	13.29