January 13, 2016. Difficulty rose by +9.12% to 113.35B from 103.88B.
Change
+9.12%
New difficulty
113.35B
Period length
12.8 days
Network hashrate then (7-day)
0.8 EH/s
Bitcoin price then
$437
Hashprice then
$1,960/PH/day
The 2,016 blocks before it took 12.8 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 9.12%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.