October 18, 2018. Difficulty fell by -3.65% to 7.18T from 7.45T.
Change
-3.65%
New difficulty
7.18T
Period length
14.5 days
Network hashrate then (7-day)
51.9 EH/s
Bitcoin price then
$6,449
Hashprice then
$207/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 3.65%: an ordinary adjustment. For every machine on the network that is a pay rise of the same size until the next retarget.