Year	Cases per 100,000
1990	21.82
1991	22.5
1992	22.79
1993	23.08
1994	22.77
1995	22.54
1996	21.01
1997	19.19
1998	17.35
1999	17.04
2000	16.66
2001	15.97
2002	15.63
2003	15.5
2004	15.53
2005	15.76
2006	15.19
2007	15.66
2008	15.78
2009	14.51
2010	13.83
2011	13.21
2012	13.44
2013	13.36
2014	12.39
2015	12.36
2016	12.43