b'2021 2020(x US$1) Staatsolie SPCS GOw2 Total Staatsolie SPCS GOw2 TotalDefined benefit obligation as at January 1(3,643,011) (46,479) (94,548) (3,784,038) (3,496,186) (28,725) (57,688) (3,582,599)Interest cost (80,231) (1,255) (2,080) (83,566) (90,253) (919) (4,863) (96,035)Pastservicecost (223,059) (11,922) (6,215) (241,196) (209,650) (3,047) (4,570) (217,267)Currentservicecost- - - - - -(24,613) (24,613)Net benefit expense (recognized in P&L) (303,290) (13,177) (8,295) (324,762) (299,903) (3,966) (34,046) (337,915)Benefitspaid 238,407-238,407 360,348-7,646 367,994Experience different than assumed 76,789 816 22,544 100,149 (106,141) (10,795) (1,091) (118,027)Changes in assumptions (194,314) (182) (664) (195,160) (101,129) (2,993) (9,369) (113,491)Sub total included in OCI (117,525) 634 21,880 (95,011) (207,270) (13,788) (10,460) (231,518)Defined benefit obligation as at December 31(3,825,419)(59,022)(80,963)(3,965,404)(3,643,011)(46,479)(94,548)(3,784,038)149'