May 17, 2015. Difficulty rose by +2.44% to 48.81B from 47.64B.
Change
+2.44%
New difficulty
48.81B
Period length
13.7 days
Network hashrate then (7-day)
0.3 EH/s
Bitcoin price then
$237
Hashprice then
$2,484/PH/day
The 2,016 blocks before it took 13.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 2.44%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.