Source: Statoshi.info
Bitcoin miner profitability decreased for three consecutive weeks as mining difficulty level reached its all-time high on the 9th of July. The latest difficulty adjustment took place at block height 586,656 on the 23rd of July and resulted in a slight decrease in mining difficulty. The difficulty level decreased by 0.56% from 9.06 trillion to 9.01 trillion.
Source: Statoshi.info, BTC.com