| Characteristic | Percentage of respondents |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Sources
Release date
December 2013
Region
Worldwide
Survey time period
2008
Supplementary notes
Percentages do not sum to 100 as respondents were able to answer to with more than one reason.
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