The company running the privatised court interpreter service in England and Wales has missed targets in its first year, figures show.
Private contractor Capita aims to meet 98% of interpreter requests but has not achieved that figure since it took over the contract on 30 January 2012.
Its overall success rate in the first year was 90%, peaking at 95% in July.
But the government says there has been a "dramatic improvement" in the service since Capita's contract began.
The figures, released by the Ministry of Justice (MoJ) also show there have been 6,417 complaints and more than 600 court trials abandoned due to a lack of interpreters over the last 12 months.
Capita achieved a 66% success rate in its first month - February 2012 - and that climbed to a high in July before declining each month after that to reach 86% in January.