Just 91.8% of patients were seen in four hours between January and March - below the 95% target.
That is the worst three-month performance since the target was introduced at the end of 2004.
The figures were widely expected as the weekly performance has been below 95% since September.
It also means the target has been missed overall for the whole of 2014-15 with 93.6% of patients seen in four hours.
It is the third time the target - it is officially measured on a quarterly basis - has been missed under the coalition.
Other parts of the UK have also been missing the target during winter.
Figures released in Scotland showed that in the 12 months up to the end of February 92% of patients were seen in four hours.