Image: Martti Kainulainen / Lehtikuva

The World Happiness Report, published Wednesday, ranks 156 countries by happiness levels, based on factors such as life expectancy, social support and levels of corruption.

The Nordic countries have dominated the index since it first was produced in 2012. Rounding out the Top 10 this year are Norway, Denmark, Iceland, Switzerland, the Netherlands, Canada, New Zealand, Sweden and Australia.

Unlike past years, the annual report published by the U.N. Sustainable Development Solutions Network also evaluated 117 countries by the happiness and well-being of their immigrants.

Last year, Finland placed fifth in the ranking.