;2nd quarter 2015;2nd quarter 2016;Change in per cent; A. TOTAL REVENUE;335887;328044;-2.3; Operating surplus extraction of petroleum;24738;17193;-30.5; Tax revenue;214380;196599;-8.3; Members' and employers' contribution to the National Insurance Scheme;55772;58564;5.0; Interest and dividends;17822;16041;-10.0; Other revenue;23175;39647;71.1; ;;;; B. TOTAL EXPENDITURE;308348;332957;8.0; Operating costs;41332;44080;6.6; Total fixed capital formation;18990;19013;0.1; Total transfers;248026;269864;8.8; ;;;; C. SURPLUS BEFORE NET TRANSFERS TO THE GOVERNMENT PENSION FUND - GLOBAL;27539;-4913;;