U may download the full blockchain and interpolate that data from there itself. All you need to know the mining addresses of different miners over time.
Kinda weird that the ponzi scamming assholes purporting to be a 'Cloud Mining' service in your sig don't ever appear, anywhere. Oh, hang, on, no it isn't weird at all, seeing as they've never been proven to be mining. Doesn't seem to stop you from spamming that sig banner of yours at every opportunity, though. Nice morality you've got there.
I tried cloud mining once, never again. It simply is n't worth it at all. There is so little money to be made mining from it.
Regardless, I saw a chart about the hashrate distribution about a month ago, I'll try to find it and post it here.
A good start is "Bitcoin hashrate distribution historical" and then work from the charts there. One old chart I found is
http://core0.staticworld.net/images/article/2013/07/bitcoin-hash-rates-100045528-orig.pngI hope this is what you were looking for, or at least something close to it.
The thing is, regular mining probably has around the same income after you extract all the costs. Since you don't feel electricity cost right away, it may not feel like this though.
The advantages are also on other fields, besides spending money on electricity. All the heat and noise generated from mining rigs can be really annoying, especially if you set it up somewhere in your living room where you are constantly reminded that its there. Also, uptime is likely higher as you don't have to physically be near your miner if something goes wrong.
Profit may be low, but it takes a lot of stress out of your hands.
