November 11, 2015. Difficulty rose by +5.77% to 65.85B from 62.25B.
Change
+5.77%
New difficulty
65.85B
Period length
13.2 days
Network hashrate then (7-day)
0.5 EH/s
Bitcoin price then
$336
Hashprice then
$3,001/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 5.77%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.