Year	Cases per 100,000
1953	33.09
1954	32.07
1955	33.34
1956	31.5
1957	29.04
1958	30.23
1959	28.15
1960	28.92
1961	26.1
1962	26.62
1963	24.11
1964	23.45
1965	24.03
1966	21.91
1967	22.14
1968	21.83
1969	20.73
1970	20.15
1971	18.7485
1972	19.237
1973	19.4655
1974	18.584
1975	17.9425
1976	16.941
1977	18.3195
1978	17.938
1979	17.9665
1980	17.305
1981	17.2535
1982	16.912
1983	18.4805
1984	16.989
1985	16.3775
1986	16.426
1987	16.3045
1988	15.733
1989	14.9515
1990	15.3
1991	14.67
1992	14.4
1993	14.25
1994	14.13
1995	13.96
1996	13.61
1997	13.08
1998	12.79
1999	12.67
2000	12.43
2001	12.49
2002	12.4
2003	12.4
2004	12.24
2005	12.09
2006	11.9
2007	11.69
2008	11.64
2009	11.37
2010	11.11
2011	11.01
2012	10.81
2013	10.63
2014	10.42
2015	10.25
2016	10.14