Sierra Leone has been ranked 135 out of 146 happiest countries in the world, according to the 2022 World Happiness Report.

The least happy in the world for 2021 was Afghanistan, whose 149th place ranking of 2.523 can be attributed in part to a low life expectancy rate and low gross domestic product rates per capita.
Rounding out the bottom twelve are Zimbabwe (3.145), Rwanda (3.415), Bostwana (3.467), Lesotho (3.512), Malawi (3.538), Haiti (3.721), Tanzania (3.623), Yemen (3.658), Burundi (3.775), India (3.849), and Sierra Leone (3.775).

Since 2002, the World Happiness Report has used statistical analysis to determine the world’s happiest countries.
In its 2021 update, the report conducted that Finland is the happiest country in the world.

To determine the world’s happiest country, researchers analyzed comprehensive Gallup polling data from 146 countries over the past three years, specifically monitoring performance in six particular categories, Gross Domestic Product per Capital, Social Support, Healthy Lifestyle Expectancy, Freedom to make your own Life Choices, Generosity of the General Population, and Perceptions of Internal and External Corruption Level.

To properly compare each country’s data, the researchers created a fictional country Christened Dystopia filled with “the world’s least happy people “. They then set Dystopia as the rock bottom value in each of the six categories and measured the scores of the real-world countries against this value.

All six variables were then blended to create a single combined score for each country.
Interestingly enough, the top seven happiest countries in the world for 2021 were all Northern European countries.

Finland took top honours for the fourth year in a row with an overall score of 7.842, followed by Denmark 7.620, Switzerland 7.571, Ireland 7.554, the Netherlands 7.464, Norway 7.392, and Sweden 7.363.