That likely would be an internal, and confidential piece of information. Plus as you probably know, there is a difference between a "sold out" cruise, and an "all berth's filled" cruise.
We did the NYE cruise 2003-2004, and that was an all berths filled cruise, which really wasn't an issue except that some of the excursions sold out 60 days in advance, and getting off the ship the last day was a nightmare.
But from what I have read here, I suspect all Disney cruises go out with at least 90 percent capacity.
My mom cruises a lot, almost always in the off season, and a number of the Celebrity cruises whe was on in March to Mexico were at 60 percent of capacity, and at highly reduced rates. She just booked an 11 day cruise on the Mercury for $799.....and 2 weeks later the
travel agent called to say the fare had be cut an additional $250.........granted, she has reserved an inside cabin, but $549 for an 11 day cruise??? And since she is a repeat Celebrity cruiser she is supposed to get a one category upgrade, which would put her in an oceanview cabin.