The Notes in the BG Group 201 I Annual Report included the following extract:

Decommissioning costs The estimated cost of decommissioning at the end of the producing lives of fields is reviewed at least annually and engineering estimates and reports are updated periodically. Provision is made for the estimated cost of decommissioning at the statement of financial position date, to the extent that current circumstances indicate BG Group will ultimately bear this cost.
Explain why the provision has been increased in 2010 and 201 I by the unwinding of discount and why these increases are for different amounts.

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Provisions for liabilities Decommissioning 2011 2010 m m As at | January Unwinding of discount 1,424 1,154 57 49