Year	Cases per 100,000
1953	29.4
1954	26.75
1955	27.85
1956	29.42
1957	28.77
1958	29.07
1959	31.4
1960	31.36
1961	30.77
1962	32.25
1963	30.17
1964	32.73
1965	30.34
1966	33.84
1967	31.7
1968	28.07
1969	28.53
1970	28.93
1971	26.2995
1972	25.629
1973	24.2885
1974	25.428
1975	23.1275
1976	25.027
1977	21.3165
1978	22.216
1979	19.6555
1980	20.515
1981	21.2845
1982	22.114
1983	20.1735
1984	18.853
1985	19.8525
1986	18.342
1987	20.4415
1988	21.131
1989	21.5605
1990	20.07
1991	19.69
1992	19.31
1993	18.52
1994	17.86
1995	17.34
1996	16.69
1997	16.18
1998	15.51
1999	15.14
2000	14.16
2001	13.73
2002	13.39
2003	13.14
2004	12.76
2005	12.42
2006	11.92
2007	11.81
2008	11.6
2009	11.24
2010	10.77
2011	10.44
2012	10.39
2013	10.25
2014	10.17
2015	9.9
2016	9.71