Year	Cases per 100,000
1953	22.18
1954	21.97
1955	19.06
1956	20.26
1957	17.74
1958	17.19
1959	17.75
1960	17.09
1961	16.57
1962	15.46
1963	14.17
1964	12.83
1965	12.92
1966	12.01
1967	12.48
1968	11.59
1969	10.47
1970	11.35
1971	10.0815
1972	10.013
1973	9.8045
1974	9.996
1975	10.0175
1976	9.289
1977	9.3205
1978	8.922
1979	8.3135
1980	8.185
1981	8.0965
1982	8.378
1983	8.3495
1984	8.211
1985	8.0325
1986	7.824
1987	8.0555
1988	8.217
1989	7.7085
1990	8.38
1991	8.12
1992	7.78
1993	7.51
1994	7.13
1995	6.92
1996	6.68
1997	6.42
1998	6.19
1999	6.05
2000	5.78
2001	5.83
2002	5.7
2003	5.66
2004	5.57
2005	5.53
2006	5.42
2007	5.24
2008	5.12
2009	4.98
2010	4.86
2011	4.77
2012	4.68
2013	4.53
2014	4.41
2015	4.26
2016	4.15