Year	Cases per 100,000
1953	18.79
1954	20.61
1955	22.21
1956	24.62
1957	25.81
1958	26.99
1959	32.15
1960	30.38
1961	34.32
1962	32.83
1963	35.89
1964	38.03
1965	40.64
1966	40.63
1967	44.31
1968	47.19
1969	46.51
1970	49.59
1971	52.3885
1972	55.627
1973	56.5855
1974	58.564
1975	59.8625
1976	61.641
1977	62.8895
1978	65.418
1979	66.6965
1980	66.995
1981	70.3535
1982	71.602
1983	73.5505
1984	72.569
1985	76.2575
1986	72.616
1987	76.7645
1988	75.323
1989	74.8215
1990	72.21
1991	70.8
1992	70.65
1993	70.74
1994	70.95
1995	70.89
1996	69.24
1997	67.75
1998	66.59
1999	66.78
2000	66.42
2001	66.47
2002	66.25
2003	65.83
2004	65.49
2005	64.74
2006	63.77
2007	62.45
2008	61.57
2009	60.4
2010	59.47
2011	58.95
2012	58.52
2013	57.41
2014	55.72
2015	54.21
2016	53.12