a question on bgd.f

I've noticed that BGD.F have a much higher traded volume than BGD on ASX, especially in the last few days the volume into the millions.

Although I don't normally look at whats happening with BGD.F, This might sound obvious but can someone knowledgeable tell me what possible reasons are there? They've got more european investors than ASX investors obviously?

And if it's the case, I might I start looking at BGD.F for indications.