Year	Cases per 100,000
1990	18.12
1991	18.59
1992	19.09
1993	19.6
1994	20.14
1995	20.7
1996	20.68
1997	20.68
1998	20.67
1999	20.67
2000	20.68
2001	20.57
2002	20.49
2003	20.44
2004	20.41
2005	20.41
2006	20.5
2007	20.62
2008	20.76
2009	20.91
2010	21.1
2011	21.53
2012	21.99
2013	22.46
2014	22.94
2015	23.43
2016	23.95