Year	Cases per 100,000
1968	21.88
1969	17.02
1970	16.29
1971	21.043
1972	20.086
1973	20.379
1974	16.012
1975	18.455
1976	17.448
1977	19.011
1978	15.644
1979	16.307
1980	18.1
1981	15.603
1982	19.566
1983	18.259
1984	18.532
1985	18.645
1986	18.888
1987	19.241
1988	18.944
1989	19.737
1990	21.16
1991	22.37
1992	21.88
1993	24.49
1994	25.3
1995	23.92
1996	21.99
1997	20.97
1998	21.08
1999	19.52
2000	19.94
2001	20.1
2002	18.94
2003	19.04
2004	18.3
2005	18.85
2006	18.72
2007	18.52
2008	18.02
2009	17.04
2010	15.89
2011	16.38
2012	16.11
2013	15.79
2014	15.27
2015	14.76
2016	14.48