§ Mr. Harperasked the Secretary of State for Trade and Industry if he will express, in percentages of the total work force in the coal mining industry, the number of miners certified as suffering from pneumoconiosis for the years 1960 to 1969, inclusive.
§ Mr. RidleyThe following percentages have been calculated using(a) the total number of National Coal Board employees in the coal mining industry at 30th September in each year and (b) the numbers of employees and former employees of the coal industry certified under the National Insurance (Industrial Injuries) Act in each year.
1960 … … … … 0.50 1961 … … … … 0.44 1962 … … … … 0.36 1963 … … … … 0.39 1964 … … … … 0.22 1965 … … … … 0.19 1966 … … … … 0.20 1967 … … … … 0.16 1968 … … … … 0.20 1969 … … … … 0.18