Over a decade roughy 0,1% of the Greenland ice sheet melts.

Greenland has lost between 3 500 en 5 000 billion tons of ice over the past two decades.

 

1 Gt gigatonne is 1 billion (miljard) tonnes or 1 km3 of water or ice. Greenland has 1,8 million square kilometers of ice which can be up to 3 kiliometers thick (high). 

The total volume of the ice is  2 850 000 cubic kilometres which tranlates to 3 million billion tons of ice. 

Say 5 000 billion tons were lost divide that by 2 850 000 billions tons, then 0,002 or 0,2% (one fifth of one percent) has been lost in total over the pas two decades. 

https://en.wikipedia.org/wiki/Greenland_ice_sheet

This year, 2022, the total amount of ice in Greenland seems to be increasing: Source http://polarportal.dk/en/greenland/surface-conditions/