1950: 67 percent and you may 13 decades 1951: 65 % and you will 15 years 1952: 66 percent and you can 16 years 1953: 66 per cent and you can 15 years 1954: 67 % and you may sixteen decades 1955: 70 percent and you can 16 decades 1956: 70 % and you can 16 age 1957: 69 per cent and you can 17 years 1958: 71 percent and you will 18 many years 1959: 73 per cent and you may 19 many years
