The report from Transparency International assessed the progress of 648 promises made by the 43 countries and six international organisations that attended the London Anti-Corruption Summit in May last year. 

It said the US, Switzerland and Japan still have unfulfilled anti-corruption pledges.

Switzerland has yet to address three quarters of the promises made, US has only completed 10% of its commitments and Japan has yet to complete any.

The UK, which hosted the summit, has completed one third of its 16 pledges but missed the deadline on three of its commitments, the report said.

Spain was the most successful and completed 74% of its commitments and Indonesia implemented 16 of its 19 pledges.

“It is pleasing to see serious progress has been made. But more needs to be done. For a start, major financial centres must take action to find and repatriate stolen assets and to stop the corrupt laundering illicit wealth,” said José Ugaz, chair of Transparency International, a non-profit, non-governmental organisation dedicated to fighting corruption.

The leaders who pledged to fight corruption said they would revisit progress of the promises at the UN General Assembly, which is currently taking place in New York.

Ugaz said the findings were presented ahead of the UN General Assembly to “underscore that it is possible to track anti-corruption commitments and it is possible to complete them”.

He said that fighting corruption is the best way to ensure “a prosperous and peaceful future” and called on countries to recommit to their promises.

Tax transparency made progress among the participating countries, with 30% of pledges complete and 36% on the protection of whistle-blowers.