Year	Cases per 100,000
1990	24.92
1991	25.24
1992	25.57
1993	26.04
1994	25.89
1995	25.46
1996	24.47
1997	23.54
1998	22.78
1999	22.06
2000	20.81
2001	20.23
2002	19.6
2003	18.72
2004	18.45
2005	17.97
2006	17.14
2007	16.21
2008	15.9
2009	16.01
2010	15.67
2011	15.44
2012	14.29
2013	13.74
2014	13.11
2015	13.05
2016	13.02