@ sky render, I have already done that myself.
check this thread:
http://www.vgchartz.com/forum/thread.php?id=20739
although you should not use the table in the OP as it is innacurate, but the one nearere the bottom I will post here with an explanation.
Regardless, there are a number of reasons why that is quite innacurate, firstly there were 2 million+ consoles available for the launch not 1 million. and secondly you have not taken into account the amount of time it takes to ship the product, I estimated based on the table (I am about to post) that it takes about 5-6 weeks for a produced console to be counted as shipped. (and then it may still be a couple of days until it is on shelves)








