Year	Cases per 100,000
1953	42.98
1954	40.11
1955	39.5
1956	38.01
1957	36.63
1958	36.46
1959	32.98
1960	33.77
1961	32.56
1962	29.73
1963	29.74
1964	29.08
1965	29.37
1966	28.62
1967	27.56
1968	28.38
1969	25.45
1970	24.22
1971	22.7605
1972	23.341
1973	22.7015
1974	21.752
1975	22.4625
1976	21.623
1977	21.6535
1978	21.244
1979	20.1845
1980	21.395
1981	21.5355
1982	22.406
1983	21.7765
1984	20.657
1985	20.2275
1986	21.228
1987	20.4285
1988	20.119
1989	20.3995
1990	21.08
1991	20.63
1992	20.15
1993	19.7
1994	18.78
1995	18.09
1996	17.48
1997	16.92
1998	16.36
1999	15.98
2000	15.32
2001	15.19
2002	14.53
2003	13.88
2004	13.07
2005	12.53
2006	11.91
2007	11.69
2008	11.25
2009	10.85
2010	10.85
2011	10.83
2012	10.59
2013	10.45
2014	10.19
2015	10.18
2016	10.16