March 18, 2016. Difficulty rose by +4.46% to 165.50B from 158.43B.
Change
+4.46%
New difficulty
165.50B
Period length
13.4 days
Network hashrate then (7-day)
1.2 EH/s
Bitcoin price then
$418
Hashprice then
$1,296/PH/day
The 2,016 blocks before it took 13.4 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 4.46%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.