How can I count supportXMR stat?

I can't find any api details. It's hard to understand for me the current values. I need to compute the expected profit for a day or for a month, etc. How can I do it?

{"hash":3570,"identifier":"global","lastHash":1525939248,"totalHashes":306413351520,"validShares":21380582,"invalidShares":785647,"expiry":1525939286814,"amtPaid":26897458215139,"amtDue":556595600361,"txnCount":0}