April 14, 2016. Difficulty rose by +7.09% to 178.68B from 166.85B.
Change
+7.09%
New difficulty
178.68B
Period length
13.1 days
Network hashrate then (7-day)
1.3 EH/s
Bitcoin price then
$424
Hashprice then
$1,201/PH/day
The 2,016 blocks before it took 13.1 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 7.09%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.