Year	Cases per 100,000
1990	15.67
1991	16.05
1992	16.44
1993	16.86
1994	17.28
1995	17.73
1996	18.04
1997	18.37
1998	18.7
1999	19.04
2000	19.4
2001	19.5
2002	19.62
2003	19.73
2004	19.85
2005	19.97
2006	20.23
2007	20.49
2008	20.77
2009	21.05
2010	21.35
2011	21.42
2012	21.49
2013	21.57
2014	21.65
2015	21.73
2016	21.81