This SPR chart is different from the others because it's historical (not current) and includes only addresses that mined over 1k coins. That means it doesn't cover the whole network hashrate, making all those numbers actually much smaller pieces of the entire pie. The top "miner" SNYq only mined for one month last year, but his 25k coins is still the highest proportion among mining addresses. There may be farms, but SPR is still supported by many small miners.
http://spreadcoin.net/explorer/index.php?q=SNYqcyEtXr5UWpxMds8mQ9x8jo8fWFJVKzMr. Spread, is it possible to make that clear on the Network Hashrate page? Or a way to make a comparable chart? I think everyone is used to looking at current hashrate charts.
I added a little note to that chart. (if someone can make a better english text, that's welcome

).
And i made a new chart: this displayed the last 1000 blocks stats: addresses who mined at least 2 blocks. (address with 1 block goes to "others")
Elbandi