During her time with the Council of Economic Advisors, Yellen oversaw a landmark report "Explaining Trends in the Gender Wage Gap" focused on the gender pay divide in June 1998. Within this study, the Council analyzed data from 1969 to 1996 to determine the cause for women to earn substantially less than men. By observing trends attributable to issues like occupation/industry as well as familial status, it was determined that while the Equal Pay Act of 1963 was a step forward, there was no explanation as to why there was a 25 percent difference between average pay for women and men – an improvement from the 40 percent gap two decades earlier. It was concluded that this gap had no correlation with differences in productivity and, as such, was the repercussions of discrimination within the workforce.