NSIDC extent numbers in 106 km2. Notice that there was a 174k loss from the 22nd to 23rd, leaving extent where it was roughly a week ago.
2016, 12, 16, 11.725,
2016, 12, 17, 11.762,
2016, 12, 18, 11.785,
2016, 12, 19, 11.853,
2016, 12, 20, 11.983,
2016, 12, 21, 11.836,
2016, 12, 22, 11.919,
2016, 12, 23, 11.745,