;1st quarter 2017;1st quarter 2018;Change in per cent; A. TOTAL REVENUE;316046;335796;6.2; Operating surplus extraction of petroleum;25906;30883;19.2; Tax revenue;154942;170575;10.1; Members' and employers' contribution to the National Insurance Scheme;97113;99651;2.6; Interest and dividends;3810;6000;57.5; Other revenue;34275;28687;-16.3; ;;;; B. TOTAL EXPENDITURE;341830;345906;1.2; Operating costs;36157;36396;0.7; Total fixed capital formation;17584;14002;-20.4; Total transfers;288089;295508;2.6; ;;;; C. SURPLUS BEFORE NET TRANSFERS TO THE GOVERNMENT PENSION FUND - GLOBAL;-25784;-10110;;