Year	Cases per 100,000
1990	29.37
1991	28.8
1992	28.16
1993	27.79
1994	26.93
1995	26.54
1996	25.48
1997	24.71
1998	23.88
1999	23.16
2000	22.52
2001	21.8
2002	21.14
2003	20.73
2004	20.28
2005	20
2006	19.76
2007	19.51
2008	19.31
2009	19.1
2010	18.97
2011	18.8
2012	18.6
2013	18.4
2014	18.21
2015	18.04
2016	17.93