Year	Cases per 100,000
1953	13.1
1954	14.27
1955	13.54
1956	15.18
1957	13.45
1958	14.05
1959	13.33
1960	14.21
1961	13.52
1962	15.62
1963	13.78
1964	14.89
1965	15.94
1966	15.66
1967	14.6
1968	13.58
1969	13.17
1970	11.41
1971	10.9885
1972	10.157
1973	8.6955
1974	9.004
1975	9.3925
1976	8.071
1977	8.3395
1978	8.168
1979	7.8965
1980	7.735
1981	9.0335
1982	7.952
1983	7.9505
1984	8.189
1985	7.9975
1986	7.706
1987	8.1645
1988	8.183
1989	8.7015
1990	8.55
1991	8.39
1992	8.19
1993	8.05
1994	7.85
1995	7.71
1996	7.75
1997	7.86
1998	7.89
1999	7.84
2000	7.81
2001	7.56
2002	7.25
2003	7.12
2004	7.04
2005	6.9
2006	6.65
2007	6.44
2008	6.32
2009	6.22
2010	6.08
2011	5.89
2012	5.75
2013	5.57
2014	5.33
2015	5.12
2016	5