From the link in OP:
Since 2009, the Gallup polling firm has surveyed people in 150 countries and territories on, among other things, their daily emotional experience. Their survey asks five questions, meant to gauge whether the respondent felt significant positive or negative emotions the day prior to the survey. The more times that people answer “yes” to questions such as “Did you smile or laugh a lot yesterday?”, the more emotional they’re deemed to be.
So judging strictly from the content in this quote the study could just be rephrased "most content/happy places."
People can be calibrated quite differently as to what they consider being emotional. Some people can raise their voice, increase their heart rate, and swing their arms about and declare, "I am not being emotional". Others can offer a slim smile and head nod and consider that they have been overwhelmed with joy. If the initial chart is accurate, I suspect this is part of the issue.
The first man to raise a fist is the man who's run out of ideas. H.G. WELLS
The first principle is that you must not fool yourself, and you are the easiest person to fool. FEYNMAN If this is monkey pee, you're on your own.SCULLY
I was going to ask about the data collection and its meaning too, I'm really interested in this and also would be interested in research which could plot the prevailence of particular sorts of personality typology too. This morning I was thinking too about whether or not anyone had researched and plotted the incidence of mental illnesses, what they were, also pro-social and anti-social behaviour and crime.
I'm actually interested in which nations have experienced the most rapid breakdown or change in their fundamental social institutions and what has been pinpointed as the significant changes contributing to or attempting to counter the same things.
Sometimes I wonder if incivility and casualisation of violence has been on the rise while serious violence or perpetual conflicts have receeded, I saw a police officer have to dismount a motorcycle after pursuing a guy and physically apprehend him today, I dont see that kind of thing very often.