Is there a chart that shows Mhps mint speed over time? My BitMinter client says that my approximate mint speed is 0.0078/per day on a MacBook Pro Retna.

I assume that this value decreases as the speed of the network increases, and therefore my contribution per block is less valuable.


Is there any chart that illustrates how Hhps diminishes value over time?
Would this chart correspond with the difficulty value/over time?
Yes, the total hash rate will correspond to the difficulty. After all, difficulty is adjusted based on how fast hashes are found.

Here is a chart on sipa.be that shows hash rate on the left axis and difficulty on the right.

Here is another hash rate chart from blockchain.info.