September 12, 2016. Difficulty rose by +2.30% to 225.83B from 220.76B.
Change
+2.30%
New difficulty
225.83B
Period length
13.7 days
Network hashrate then (7-day)
1.6 EH/s
Bitcoin price then
$604
Hashprice then
$707/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 2.30%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.