Taxes And National Insurance 12. Dr. Kim Howells To ask the Chancellor of the Exchequer what his most recent forecast is for the proportion of non-oil gross domestic product that taxes and national insurance contributions will represent in 1991–92. Mr. Maude 37·1 per cent. 15. Dr. Kumar To ask the Chancellor of the Exchequer what proportion of non-oil gross domestic product non-oil taxes and national insurance contributions represented in (a) 1978–79 and (b) 1991–92. Mr. Maude 34·7 per cent. and 37·1 per cent. respectively.