When trying to lose weight it's generally safe to lose at most 10 lbs of weight per month.
Trying to lose anymore than 10 lbs of weight per month can be unsafe for most people although some people have lost 15 lbs in a month but that's rare and not very safe to try.
On average most people lose between 2 to 5 lbs of weight per month which is much safer but if you can lose 10 lbs of weight per month then that's pretty safe too.
So if you lose between 5 lbs to 10 lbs of weight per month you can expect to safely lose between 60 lbs to 120 lbs of weight per year.
That's the average weight loss per year of between 60 lbs to 120 lbs of weight per year.