Would you like to be more specific with your question? Are you talking about condos, coops, townhomes?
I'm pressuming you are trying to price your apartment for sale, but I could be wrong.
It's hard to say what the appreciation was without knowin what we are talking about here, but I can tell you that in the last year the average depreciation was around 10%. As an overall in Manhattan it's over 26%.
Don't hesitate to reach out if you want more spefici answers.