Year	Cases per 100,000
1990	23.36
1991	23.34
1992	23.25
1993	23.15
1994	22.99
1995	22.64
1996	21.71
1997	20.74
1998	19.88
1999	18.88
2000	18.23
2001	17.75
2002	17.51
2003	17.29
2004	16.99
2005	16.82
2006	16.6
2007	16.39
2008	16.1
2009	15.78
2010	15.53
2011	15.41
2012	15.33
2013	15.32
2014	15.43
2015	15.17
2016	14.9