I think you are confusing revenue with profit, but here is historical revenue data. I downloaded from blockchain.info two files: Miners Revenue (total value of coinbase block rewards and transaction fees paid to miners) and Hash Rate (estimated number of tera hashes per second). I divided the first by the second to get revenue per TH/s, et voila...
your chart is a joke
another shock value statement to get attention.
I started in July 2012 the network was 14 th
which was mostly gpus 2-3 per gh
or say 2500 per th so 2500 hd7970's were worth about 300 each = 750,000 usd a th for summer of 2012
and power used was close to 500,000 watts for that 1 th so what if it earned 10,000 a th per day
(Moderator's note: This post was edited by frodocooper to remove a nested quote and to trim the quote from Bucc5207.)