March 4, 2016. Difficulty fell by -3.10% to 158.43B from 163.49B.
Change
-3.10%
New difficulty
158.43B
Period length
14.5 days
Network hashrate then (7-day)
1.1 EH/s
Bitcoin price then
$420
Hashprice then
$1,374/PH/day
The 2,016 blocks before it took 14.5 days, longer than the 14 intended, so hashrate had fallen, and difficulty fell by 3.10%: an ordinary adjustment. For every machine on the network that is a pay rise of the same size until the next retarget.