Finland has topped an index of the happiest nations for the second year in a row, while Iran ranked 117th out of 156 countries.
The report is based on economic wealth, life expectancy, social support, freedom to make life choices and levels of government corruption.
Denmark, Norway, Iceland, the Netherlands, Switzerland, New Zealand, Canada, and Austria followed the crowned Finland as the top ten. Southern Sudan stayed at the bottom of the table, lower than the Central African Republic, Afghanistan, Tanzania, Rwanda, Yemen, Malawi, Syria, Botswana, Haiti, and Zimbabwe.
It is the second year the U.N. Sustainable Development Solutions Network evaluated 117 countries by the happiness and well-being of their citizens and immigrants as part of the annual report.
The Islamic Republic of Iran ranked 117th, eleven spots lower than last year.
The new report shows that out of twenty countries that have gained top spots at the table of happiest nations, ten are in Central and Eastern Europe.
Meanwhile, Yemen, India, Syria, Botswana, and Venezuela had the bleakest records in the past years.
Israel at 13, gained a spot among the twenty happiest nations on earth, the Czech Republic ended at 20, Russia at 68, Tajikistan 74, Azerbaijan at 90, and Armenia at 116, one spot higher than Iran.
The first report on the happiest nations was published in 2012.
The report was compiled by prominent economists John F. Helliwell, Richard Layard, and Jeffrey D. Sachs.