Year	Cases per 100,000
1990	22.63
1991	22.23
1992	21.93
1993	21.51
1994	21.15
1995	20.85
1996	20.57
1997	20.29
1998	19.88
1999	19.33
2000	18.81
2001	18.23
2002	17.73
2003	17.24
2004	16.8
2005	16.56
2006	16.01
2007	15.55
2008	15.17
2009	14.82
2010	14.59
2011	14.37
2012	14.1
2013	14.01
2014	13.94
2015	13.81
2016	13.54