WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

NORGES BANK's Holding History (CIK: 0001374170)

Note: Option positions (PUT/CALL) are excluded.

Q1 2013
Shares 205,700 Value ($000) $2,020 Avg Close — Range —
Q3 2012
Shares 649,212 Value ($000) $4,079 Avg Close — Range —
Q2 2012
Shares 324,606 Value ($000) $2,223 Avg Close — Range —