December 31, 2015. Difficulty rose by +11.16% to 103.88B from 93.45B.
Change
+11.16%
New difficulty
103.88B
Period length
12.6 days
Network hashrate then (7-day)
0.8 EH/s
Bitcoin price then
$428
Hashprice then
$2,084/PH/day
The 2,016 blocks before it took 12.6 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 11.16%: one of the largest adjustments on record. For every machine on the network that is a pay cut of the same size until the next retarget.