Year	Cases per 100,000
1990	16.81
1991	17.28
1992	17.78
1993	18.31
1994	18.86
1995	19.45
1996	19.72
1997	19.99
1998	20.27
1999	20.55
2000	20.84
2001	21.12
2002	21.41
2003	21.71
2004	22.02
2005	22.33
2006	22.82
2007	23.32
2008	23.83
2009	24.37
2010	24.92
2011	25.49
2012	26.08
2013	26.7
2014	27.33
2015	27.98
2016	28.66