 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: OPERATING LEASE, RENTAL  DEPRECIATION  LEASE  ($ in millions) AND OTHER INCOME  AND OTHER  MARGIN 2009  $  508.0  $ 456.1  $ 51.9 Increase (decrease)  Operating lease impairments (23.9) 23.9 Results on returned lease assets  (16.3) 16.3 Used trucks taken on trade package  12.7 12.6 .1 Average operating lease assets  3.4 2.9 .5 Revenue and cost per asset  29.7 27.4 2.3 Currency translation  (5.6) (4.6) (1.0) Insurance and other  (2.0) (2.6) .6 Total increase (decrease)  38.2 (4.5) 42.7 2010  $  546.2  $ 451.6  $ 94.6 •   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 $27.4 million is due to higher vehicle operating expenses, including  higher fuel costs and variable costs from higher asset utilization levels. The following table summarizes the provision for losses on receivables and net charge-offs. ($ in millions) 2010  2009 PROVISION FOR  PROVISION FOR  NET  LOSSES ON  NET  LOSSES ON  CHARGE-OFFS  RECEIVABLES  CHARGE-OFFS   RECEIVABLES U.S. and Canada  $  35.7  $  21.0  $  63.1  $ 49.0 Europe   27.2 20.9   30.8  28.8 Mexico and Australia  20.4 19.1 14.3 13.0 $  83.3  $  61.0  $ 108.2  $ 90.8