January 1, 2020. Difficulty rose by +6.57% to 13.80T from 12.95T.
Change
+6.57%
New difficulty
13.80T
Period length
13.2 days
Network hashrate then (7-day)
97.1 EH/s
Bitcoin price then
$7,207
Hashprice then
$143/PH/day
The 2,016 blocks before it took 13.2 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 6.57%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.