February 19, 2016. Difficulty rose by +13.44% to 163.49B from 144.12B.
Change
+13.44%
New difficulty
163.49B
Period length
12.3 days
Network hashrate then (7-day)
1.1 EH/s
Bitcoin price then
$421
Hashprice then
$1,298/PH/day
The 2,016 blocks before it took 12.3 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 13.44%: 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.