| Characteristic | Increased | Stayed the same | Decreased |
|---|---|---|---|
| - | - | - | - |
| - | - | - | - |
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Sources
Release date
September 2011
Region
Worldwide
Survey time period
2009 / August 2011 and September 2011
Number of respondents
n = 143 (2009) / 450 (2011)
Special properties
online publishers, sales houses and rep firms
Method of interview
Online survey
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