Year	Cases per 100,000
1990	30.74
1991	31.15
1992	29.17
1993	28.83
1994	31.64
1995	31.29
1996	28.52
1997	23.79
1998	22.22
1999	22.08
2000	21.83
2001	20.55
2002	20.28
2003	20.19
2004	20.23
2005	21.18
2006	20.4
2007	20.26
2008	19.58
2009	19.23
2010	19.53
2011	17.24
2012	17.27
2013	15.97
2014	16.2
2015	16.39
2016	16.15