OPEC agreed in early December to renew for six months its 30m bpd output cap for the first half of the year to keep prices above $100. However, quotas have in the past proved difficult for OPEC as a group to enforce without any binding penalties for over-producing. Since its restoration to OPEC following the 2003 Gulf War, Iraq has been excluded from the group's quota system to allow its economy to recover but pressure is mounting for it to comply this year.