Year	Cases per 100,000
1990	30.33
1991	29.28
1992	28.35
1993	27.68
1994	26.59
1995	25.4
1996	24.38
1997	23.21
1998	22.18
1999	20.99
2000	20.06
2001	19.43
2002	19.01
2003	18.99
2004	18.62
2005	18.45
2006	18.15
2007	17.93
2008	17.76
2009	17.7
2010	17.1
2011	17.52
2012	17.53
2013	17.41
2014	17.16
2015	17.15
2016	17.17