The WIN/Gallup International's End of Year survey is an annual tradition initiated by and designed under the chairmanship of Dr. George Gallup in 1977. It is conducted every year since then. This year it was carried out by the WIN/Gallup International Association in 68 countries around the world.
Sample Size and Mode of Field Work:
A total of 66040 persons were interviewed globally. In each country a representative sample of around 1000 men and women was interviewed either face to face (30 countries; n=32172), via telephone (15 countries; n=11800) or online (23 countries; n=22068). The field work was conducted during September 2015 - December 2015. The margin of error for the survey is between +/- 3-5% at 95% confidence level.