Year	Cases per 100,000
1990	22.73
1991	23.62
1992	23.86
1993	23.72
1994	23.45
1995	23.22
1996	23.16
1997	22.45
1998	21.74
1999	21.99
2000	21.9
2001	21.84
2002	22.04
2003	21.2
2004	21.49
2005	21.03
2006	21.18
2007	20.26
2008	20.02
2009	19.81
2010	19.03
2011	18.13
2012	17.71
2013	17.34
2014	16.78
2015	16.38
2016	16.02