International Women’s Day, celebrated on March 8, has many different versions of its origin—linked to women’s voting rights, to labor issues, to political upheavals—but all agree that it started more than 100 years ago. Yet it was only in 1975 that the United Nations General Assembly began celebrating March 8 as International Women’s Day. Now it is celebrated in more than 100 countries and is an official holiday in more than 25.

This year’s theme is #BeBoldforChange and emphasizes a call for accelerating gender parity. The 2016 Global Gender Gap Report, which ranks gender-based disparities in 144 countries and tracks their progress over time, predicts that the gender gap won’t close entirely until 2186—a disheartening statistic.

Gender inequality and the data behind that reality have been a key focus of PRB’s work since its beginning in 1929. PRB has worked to disaggregate data across countries and to interpret the policy impacts of that data. Some of our recent contributions have included articles and briefs on benefits of and barriers to investing in women and girls for development, as well as innovative infographics that help explain the gender wage gap and complex data on family planning. And on this International Women’s Day we recognize again some of the women who have embodied the #BeBoldforChange motto whom we have interviewed over the years—Mary Robinson, Nafis Sadik, and Molly Melching.

Explore the interviews and other PRB features:

Ending Child Marriage—An Interview With Mary Robinson

Commemorating International Women’s Day—An Interview With Nafis Sadik

Abandoning Female Genital Mutilation/Cutting—An Interview With Molly Melching

Investing in Women and Girls for a Gender Dividend

Occupational Earnings Gap

Demand Satisfied: Understanding the Sustainable Development Goal Indicator for Family Planning