March 22, 2015. Difficulty fell by -1.50% to 46.72B from 47.43B.
Change
-1.50%
New difficulty
46.72B
Period length
14.2 days
Network hashrate then (7-day)
0.3 EH/s
Bitcoin price then
$260
Hashprice then
$2,965/PH/day
The 2,016 blocks before it took 14.2 days, longer than the 14 intended, so hashrate had fallen, and difficulty fell by 1.50%: an ordinary adjustment. For every machine on the network that is a pay rise of the same size until the next retarget.