See https://blockchain.info/charts

I count about 4 charts that are to do with the price and 40 charts for whats going on under the bonnet
because the system is over complicated but it is a good site for getting data and one I often use myself
not that i care to do any mining.

The block-chain solved a few problems and created many more in return as we are starting to see because
it was born out of academia that sold its sole to avoid anything that could be remotely called centralization
but if you look closer new nodes being started up use existing DNS servers to get them started on the network

This chart lets the cat out of the bag when you look how centralized it as all become
https://blockchain.info/pools
Ten big names account for 90% of all transactions and they have got us by the balls unlike DNS servers
that don't touch the money/digits and if closed down can be replaced in a system we need to be moving towards