Year	Cases per 100,000
1990	28.25
1991	27.67
1992	27.11
1993	26.33
1994	25.45
1995	24.93
1996	23.7
1997	22.81
1998	21.69
1999	20.76
2000	19.89
2001	19.55
2002	19.43
2003	19.1
2004	18.63
2005	17.83
2006	17.39
2007	16.63
2008	16
2009	15.49
2010	15.03
2011	15.08
2012	14.87
2013	14.96
2014	14.98
2015	15.16
2016	15.31