Daily gice updated again. Latest day now 145 , the volume calculated from it has dropped to 19.0 [1000km3].
Here is the sequence for May 1-25:
array([ 20.63, 20.62, 20.61, 20.58, 20.57, 20.55, 20.51, 20.42,
20.38, 20.33, 20.32, 20.25, 20.22, 20.19, 20.07, 20. ,
19.88, 19.8 , 19.69, 19.6 , 19.51, 19.39, 19.26, 19.15,
19.01])