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The major factors for the change in operating lease, rental and other income, depreciation and other expense and lease margin for the year ended December 31, 2010 are outlined in the table below: 

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•  Operating lease impairments decreased $23.9 million in 2010 due to improving used truck prices ($17.5 million) and fewer losses on repossessed operating lease equipment ($6.4 million). 

•  Results on sales of trucks returned from leases improved $16.3 million in 2010 also reflecting higher used truck prices as a result of the increased demand for used trucks in an improving global economy. 

•  The $12.7 million increase in trucks taken on trade and associated cost of $12.6 million are due to an increase in the volume of trucks sold. 

•  Higher average operating lease assets in 2010 ($21.3 million) increased income by $3.4 million and related depreciation on operating leases by $2.9 million. 

•  Higher truck market demand resulted in an increase in revenues per asset in 2010 of $29.7 million. The increase in revenue consisted of higher asset utilization (the proportion of available operating lease units that are being leased) of $13.5 million, higher lease rates of $10.7 million and higher fuel and service revenue of $5.5 million. 

•  The 2010 increase in costs per asset of $27.4 million is due to higher vehicle operating expenses, including higher fuel costs and variable costs from higher asset utilization levels. 

The following table summarizes the provision for losses on receivables and net charge-offs. 

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