Yemen, the Arab world’s poorest country, spent more last year on importing oil than it made from exports for the first time in almost 30 years, raising concern about the fragile, internationally-backed transition process in a country that relies on income from hydrocarbons for the majority of its revenues.

Sana’a earned $2.66bn from oil sales at home and abroad in 2013, and spent $2.93bn on imports, according to the Central Bank of Yemen.

The bank blamed the fall in income on a record number of attacks on a major pipeline that connects the oil-rich province of Mareb with Ras Issa on the country’s west coast.