Year	Cases per 100,000
1990	26.35
1991	26.45
1992	26.62
1993	26.65
1994	27.02
1995	27.12
1996	27.45
1997	27.54
1998	27.74
1999	27.63
2000	27.17
2001	26.51
2002	25.83
2003	25
2004	23.82
2005	22.8
2006	22.06
2007	21.04
2008	20.43
2009	19.98
2010	19.49
2011	18.38
2012	17.91
2013	17.35
2014	17.09
2015	16.81
2016	16.53