OPEC oil supply sank to a four-year low in March, a Reuters survey found, as top exporter Saudi Arabia over-delivered on the group’s supply cut pact while Venezuelan output posted a further drop due to sanctions and power outages.

The 14-member OPEC pumped 30.40 million barrels per day (MMbbl/d) last month, the survey showed on April 1, down 280,000 bbl/d from February and the lowest OPEC total since 2015, according to a Reuters survey.

The survey suggests that Saudi Arabia and its Gulf allies are pressing ahead with even larger supply cuts than called for by OPEC’s latest deal, shrugging off pressure from U.S. President Donald Trump to increase supply. On March 28, Trump again called for OPEC to pump more oil to lower prices.

Crude oil is trading above $68 per barrel, close to a 2019 high, boosted by the Saudi move and involuntary supply curbs in Venezuela and Iran which are both under U.S. sanctions that are limiting their exports.

OPEC, Russia and other non-members—an alliance known as OPEC+—agreed in December to reduce supply by 1.2 MMbbl/d from Jan. 1. OPEC’s share of the cut is 800,000 bbl/d, to be delivered by 11 members—all except Iran, Libya and Venezuela,

In March, the 11 OPEC members bound by the new agreement achieved 135% of pledged cuts, the survey found, up from 101% in February.

Among exempt producers, Venezuelan supply fell by 150,000 bbl/d as power cuts hit exports, adding to the impact of U.S. sanctions on state oil company PDVSA and a long-term decline in production.

The latest OPEC+ deal came just months after the group agreed to pump more oil, which in turn partially unwound their original supply-limiting accord that took effect in 2017.

March’s output is the lowest by OPEC as a group since February 2015, excluding membership changes that have taken place since then, according to Reuters surveys.

The Reuters survey aims to track supply to the market and is based on shipping data provided by external sources, Refinitiv Eikon flows data and information provided by sources at oil companies, OPEC and consulting firms.