b'2019 2018(x US$1) GOw2 SPCS Total GOw2 SPCS TotalDefined benefit obligation as at January 1 (582,489) (303,064) (885,553) (491,689) (239,962) (731,651)Interest cost (44,017) (22,730) (66,747) (60,325) (30,125) (90,450)Currentservicecost (55,812) (49,404) (105,216) (53,606) (46,611) (100,217)Net benefit expense (recognized in P&L) (99,829) (72,134) (171,963) (113,931) (76,736) (190,667)Benefitspaid 11,780-11,780 6,610-6,610Currency translation (9,765)-(9,765) 6,017 (1,038) 4,979Experience different than assumed (77,234) 4,774 (72,460) 82,824 5,925 88,749Changes in assumptions (14,116) 7,249 (6,867) (72,320) 8,748 (63,572)Sub total included in OCI (101,115) 12,023 (89,092) 16,521 13,634 30,155Defined benefit obligation as at December 31(771,653)(363,175)(1,134,828)(582,489)(303,064)(885,553)2019 2018(x US$1) Staatsolie SPCS Total Staatsolie SPCS TotalDefined benefit obligation as at January 1 (859,522) (8,557) (868,079) (893,525) (8,128) (901,653)Interest cost (41,957) (419) (42,376) (40,076) (366) (40,442)Currentservicecost (37,079) (1,388) (38,467) (41,832) (1,473) (43,305)Net benefit expense (recognized in P&L) (79,036) (1,807) (80,843) (81,908) (1,839) (83,747)Benefitspaid 7,502-7,502 6,006-6,006Experience different than assumed (8,658)223(8,435) (8,340) (274) (8,614)Changes in assumptions (292,686) (5,894) (298,580) 118,245 1,684 119,929Sub total included in OCI (301,344) (5,671) (307,015) 109,905 1,410 111,315Defined benefit obligation as at December 31(1,232,400)(16,035)(1,248,435)(859,522)(8,557)(868,079)105'