Today is Equal Pay Day in the US. It marks the date women need to work into 2019 to earn what men were paid in the previous year. (And, in fact, this particular date does not take into account that women of color are often paid less than white women.)
Collecting, sharing, maintaining (and possibly publishing) diversity data (of any type but including gender pay) remains a significant undertaking for employers. And the complexity compounds for multinationals.
The global trend towards requiring transparency is not slowing. Just recently, France, Spain and soon Ireland have jumped aboard.