Gender diversity on public company boards has become a hot-button issue in recent years, as investors and other governance advisors have shined a spotlight on the low representation of women in the boardroom.

Because progress has been slow, and women still only account for a fraction of the total board seats available, the discussion surrounding board diversity has been contentious at times. It’s not without good reason. In the latest Equilar Gender Diversity Index (GDI)—a quarterly update of female directors in the Russell 3000—just 15.9% of board seats belonged to women as of March 31, 2017, up from 15.1% for the full year 2016.

View or download key highlights from the latest Equilar GDI report by clicking here.