;2nd quarter 2017;2nd quarter 2018;Change in per cent; A. TOTAL REVENUE;324161;341375;5.3; Operating surplus extraction of petroleum;22482;22417;-0.3; Tax revenue;211123;224784;6.5; Members' and employers' contribution to the National Insurance Scheme;58126;61018;5.0; Interest and dividends;19404;20220;4.2; Other revenue;13026;12936;-0.7; ;;;; B. TOTAL EXPENDITURE;337213;338264;0.3; Operating costs;41363;42603;3.0; Total fixed capital formation;14228;16746;17.7; Total transfers;281622;278915;-1.0; ;;;; C. SURPLUS BEFORE NET TRANSFERS TO THE GOVERNMENT PENSION FUND - GLOBAL;-13052;3111;;