BP shareholders voted on April 14 to oppose Chief Executive Bob Dudley $20 million pay package for 2015, the rare revolt reflecting outrage after the British oil and gas company recorded its biggest annual loss.

Some 59.11% of shareholders voted against the pay in a stark contrast with previous years when over 80% and sometimes as many as 90% voted in favor of high pay packages.

Dudley was due to receive 20% more in 2015 than in 2014 even though shrinking profit margins triggered by sharp falls in the price of oil led to more than 5,000 job losses at the company last year.

Even though the vote is non-binding, BP executives said they would consider it very seriously and that they were planning to review the remuneration mechanism in the next few months and possibly link it to oil prices.

BP had long argued that executive rewards should be based on a combination of factors including cash generation and operational performance.

Last year, Dudley also clinched a final settlement with U.S. authorities over the 2010 Gulf of Mexico spill, which many investors said at the time removed uncertainty around the firm’s future.

The shareholders had nevertheless revolted against the pay with Britain’s biggest mutual life and pensions fund, Royal London, and two shareholder advisers, Institutional Shareholder Services and Glass Lewis, all recommending rejecting it.

“This is a significant vote. It gives the board an opportunity to reflect on remuneration policy. The commitment to talk to shareholders (about remuneration) is important,” said Adam Matthews, head of the Church of England’s Secretary of the Ethical Investment Advisory Group. The Church of England is a shareholder in BP.

“We will review remuneration policy to see how we can simplify it while retaining strong link to long term performance,” said Ann Dowling, the head of BP’s remuneration committee.

"Shareholder criticism raises some fundamental question around our policy and we will consider those in the coming months," she added.