Results of running the script for 100 blocks (#7021700 - #7021800).
>>> sizes = [852946, 221839, 637053, 672740, 1093313, 225852, 1678145, 761029, 1419458, 1152028, 653192, 67545, 29260, 249825, 1526471, 76492, 791376, 0, 204216, 973265, 561570, 579943, 1515495, 1738738, 1717572, 395549, 354647, 16870, 551612, 89760, 1848829, 290080, 505966, 22421, 1471108, 28740, 1578582, 880692, 13205, 1442855, 1255767, 644168, 1634534, 2631529, 869398, 437570, 452382, 1236448, 870726, 203800, 570037, 446159, 6947, 55375, 599809, 308926, 113536, 0, 605908, 357154, 829124, 1583076, 1413534, 854483, 198182, 1015926, 1080430, 59555, 1106610, 205846, 445871, 379150, 980513, 72306, 1293635, 40396, 942147, 561540, 297171, 1035896, 917608, 272911, 776640, 0, 1293114, 627284, 3675, 965540, 32970, 168510, 113672, 863180, 25912, 1245664, 532234, 576862, 1332396, 590317, 760537, 1295538, 1543689]
>>> len(sizes)
101
>>> np.mean(sizes)
698258.3762376237