Year	Cases per 100,000
1990	27.3
1991	27.19
1992	27.3
1993	27.04
1994	25.94
1995	25.4
1996	25.43
1997	24.48
1998	23.72
1999	23.15
2000	22.63
2001	22.34
2002	22.21
2003	22.22
2004	21.83
2005	20.91
2006	20.78
2007	20.37
2008	20.07
2009	19.83
2010	19.74
2011	19.55
2012	19.61
2013	19.53
2014	19.17
2015	19.09
2016	19.25