Loot Bonus On Chests?

I was wondering the exact rate of loot bonus to chest bonus, since it seems to be non-linear and different after about 100+%(also I how do you sort by tags I can't seem to find that in thread sort options)

EDIT: I found an old bug fix post by jp, saying
"The first 20% loot bonus give 20% bonus as it always did.
The second 20% loot bonus, however, gives only 15% actual loot bonus.
The third 20% adds only 10% loot bonus, the fourth only 5%.
This makes the first 80% loot bonus give only 50% actual loot bonus.
After that every 5% loot bonus give 1% extra actual loot."

Is this still true or no

 

Yes, it's still true