Fidelity's Bitcoin mining business leader, Jurica Bulovic, recently tweeted to analyze and summarize the changes in the difficulty of Bitcoin mining over the years. On December 30, 2009, Bitcoin mining difficulty was adjusted for the first time, increasing from 1 to 1.1829, an increase of 18.29%. The next year, in 2010, the miners started GPU mining. Bitcoin mining difficulty continued to increase, from 1.18 to 14,500, to 12,245 times. In 2013, the mining machine appeared and began to carry out ASIC mining. In that year, the difficulty of Bitcoin mining increased by 39533%. Starting in 2010, the difficulty of bitcoin mining has increased every year, trying to catch up with the price increase, until this year, the difficulty of bitcoin mining has dropped significantly historically.
In addition, only five times in the history of Bitcoin, the difficulty of mining has dropped to double digits. The first three major declines were: October 21, 2011, a decrease of 18.03%; March 26, 2020, a decrease of 15.95%; December 3, 2018, a decrease of 15.13%