In 2008, the average price of iron ore was set at $56 per tonne.

Looking ahead, the price by the year 2000 was expected to be no more than about $50 per tonne.

Copper hit its high for 2011 in February at more than $10,000 per tonne.

The German price of €100/£49 per tonne was typical for the year 2003 and it steadily rose over the years.

They were able to make a profit of $2,260 rather than $1,700 per tonne.

The profit after transport is estimated to be around €15 to €30 per tonne.

The cost of clean fill also increased to $20 per tonne on that date.

Consider, for example, the big difference between expenses and the trading price per tonne of tuna.

I note from the figures that the cost per tonne seems to have gone down.

The lower rate is £2.50 per tonne from 1 April 2010 to 31 March 2012.