Year	Cases per 100,000
1990	23
1991	22.26
1992	21.5
1993	20.86
1994	20.34
1995	19.8
1996	19.77
1997	19.53
1998	19.95
1999	19.06
2000	19.08
2001	17.84
2002	17.4
2003	16.85
2004	16.23
2005	15.76
2006	15.55
2007	15.08
2008	14.92
2009	14.81
2010	14.83
2011	14.77
2012	14.91
2013	15.14
2014	15.71
2015	15.66
2016	15.64