SCOTLAND'S share of North Sea revenues amounted to just £21million in the third quarter of last year, according to new figures which highlighted the ongoing impact of low oil prices on the economy.

Official quarterly national accounts for Scotland showed the country continued to be less well off than the rest of the UK.

Scotland's share of oil revenue from July to September was more than 100 times smaller than a few years ago.

In the same period in 2011, revenues amounted to £2.7billion and were £4.3billion in 2008.

The figures kept Scotland's gross domestic product per head - the main measure of a nation's wealth - 1 per cent below that of the rest of the UK.

GDP per head in Scotland was equivalent to £28,500 compared with £28,700 across the UK as a whole.

Two years ago, Scotland's GDP per head was 6 per cent higher than the rest of the UK.

The figure was widely used during the independence referendum when then-first minister Alex Salmond used Scotland's relative wealth as a key part of his economic case for leaving the UK.

Murdo Fraser, the Scots Tory MSP, said: "Had we followed the SNP's advice in the referendum, we would now be six weeks away from Scotland being pulled out of the UK. "These economic figures show we would be six weeks away from walking off a cliff."

He added: "In light of these figures, it is time for John Swinney to deliver an economic strategy which incentivises growth - not one that puts up tax bills on firms across Scotland, as he proposing right now."

Earlier, during Prime Minister's Questions, David Cameron also took a swipe at the SNP, which had March 24 pencilled in as 'independence day', telling MPs Scotland would be facing a "financial calamity".

Deputy First Minister John Swinney said Scotland faced a "challenging global economic environment".

But he added: "Today’s statistics show that in the latest 12 months Scotland’s GDP was £153billion, or £28,500 per person, which means in the latest full year for which results are available, 2014, our national output per head remained the highest in the UK outside London and South-east England, and our annual GDP per head was higher than that of the UK, France and Japan."