Reduce Skype Bandwidth Usage

I'm based in Mozambique where bandwidth is still quite limited and expensive.
Recently we have upgraded and now get 10GB up and down and the speed is now up to 1024 from 512kbps. We use skype to call home.

Apparently since increasing our bandwidth Skype has increased video quality automatically resulting in us exceeding our bandwidth.

As video quality is not too important to us is there any way to manually reduce the quality again in order to save bandwith.

Cheers