Maintenance: Retention rate, EU-27 vs United States vs China
The retention rate captures year-to-year changes in the inflow of contributors entering the ecosystem (Note: The ecosystem
is measured based on GitHub data. GitHub is the largest code hosting platform globally with over 100 million developers and
hundreds of millions of repositories covered).
It is defined as the ratio of contributors entering in a given year relative to those entering in the previous year, which
reflects the capacity of a country’s open-source ecosystem to sustain or expand participation over time.