| Characteristic | Less than three months | Four to six months | Seven to 12 months | 13 to 24 months | 25 to 36 months | 37 to 48 months | More than 48 months |
|---|---|---|---|---|---|---|---|
| - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - |
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Source
Sources
Release date
October 2017
More information
Region
Worldwide
Survey time period
2014 to 2017
Number of respondents
1,876 respondents
Supplementary notes
* The source did not provide data for the 2014-15 survey.
The survey did not provide the survey method or age of respondents.
Number of respondents for previous surveys:
2013-14: 1,270 respondents
2015-16: 1,679 respondents.
Percentage points less than 100 percent are probably due to rounding.
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