The University of Michigan maintained its spot as the world’s 21st top institution, according to Times Higher Education.

The annual list ranks the top 400 universities worldwide and is based on 13 performance indicators separated into five categories: teaching, research, citations, industry income and international outlook.

The London-based higher education magazine worked with Thomson Reuters to produce “World University Rankings 2017-2018.”

The ranking is one of two released annually by Times Higher Education. Earlier this year, U-M was ranked 15th in the organization’s annual Reputation Rankings, which are based on results from an invitation-only survey of scholars from around the world.