Here’s an example:
A recent study by the European Social Survey concluded that levels of wellbeing had increased in all of the 21 countries surveyed.
The report is the result of an extensive, nuanced study of wellbeing across Europe and offers many interesting insights, such as the fact that the wellbeing of women vs. men varies greatly between countries. (In most nations men are the happiest). Another interesting finding is that large variations in wellbeing amongst different population groups do not appear to be inevitable.
Whatever aspect of wellbeing you may be interested in, you’re almost certain to find answers in this report. It can be accessed free of charge.