b'2019 2018(x US$1) Staatsolie SPCS GOw2 Total Staatsolie SPCS GOw2 TotalDefined benefit obligation as at January 1(2,987,963) (19,694)-(3,007,657) (2,964,598) (17,941)-(2,982,539)Interest cost (111,280) (847)-(112,127) (130,171) (807)-(130,978)Pastservicecost- -(55,899) (55,899) - - - -Currentservicecost (172,417) (3,006)-(175,423) (167,992) (2,652)-(170,644)Net benefit expense (recognized in P&L) (283,697) (3,853) (55,899) (343,449) (298,163) (3,459)-(301,622)Benefitspaid 149,218- -149,218 132,224- -132,224Experience different than assumed (7,007) 920-(6,087) 241,263 182-241,445Changes in assumptions (366,737) (6,098) (1,789) (374,624) (98,689) 1,524-(97,165)Sub total included in OCI (373,744) (5,178) (1,789) (380,711) 142,574 1,706-144,280Defined benefit obligation as at December 31(3,496,186)(28,725)(57,688)(3,582,599)(2,987,963)(19,694)- (3,007,657)107'