In a large-scale survey conducted from 2010-2012 across more than 150 countries, individuals rated their lives on a scale from 0 ("worst possible life") to 10 ("best possible life"). The worldwide average score reported was 5.2.

Global Life Satisfaction Findings (2010-2012)

https://en.wikipedia.org/wiki/World_Happiness_Report

Indiana University

The World Happiness is an annual report produced by the United Nations Sustainable Development Solutions Network.  The report primarily uses data gathered by the Gallup World Poll, and other additional sources, the study produces articles, rankings, and other figures.  It uses factors gathered from the surveys and other quality of life factors during the formation of the report.  

World Happiness Report 

The World Happiness Report 2021 focuses on the effects of COVID-19 and how people all over the world have fared.  With a particular focus on the effects of Covid-19 on the quality and structure of peoples' lives.  

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