| Characteristic | 4th Quarter 2010 | 4th Quarter 2011 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Source
Release date
March 2012
Region
Worldwide
Survey time period
4th quarter 2010 and 4th quarter 2011
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