December 13, 2020. Difficulty fell by -2.54% to 18.67T from 19.16T.
Change
-2.54%
New difficulty
18.67T
Period length
14.4 days
Network hashrate then (7-day)
132.1 EH/s
Bitcoin price then
$18,762
Hashprice then
$131/PH/day
The 2,016 blocks before it took 14.4 days, longer than the 14 intended, so hashrate had fallen, and difficulty fell by 2.54%: an ordinary adjustment. For every machine on the network that is a pay rise of the same size until the next retarget.