Year	Cases per 100,000
1990	20.77
1991	20.99
1992	21.25
1993	21.51
1994	21.78
1995	22.07
1996	22.5
1997	22.97
1998	23.45
1999	23.94
2000	24.47
2001	25
2002	25.57
2003	26.16
2004	26.77
2005	27.42
2006	27.81
2007	28.2
2008	28.61
2009	29.04
2010	29.49
2011	29.82
2012	30.18
2013	30.54
2014	30.91
2015	31.28
2016	31.68