X Factor 2010 Vote Analysis

Once again, here's the voting data for X Factor 2010 (from the official PDF).  I've normalised it according to the number of contestants each week: if there are 5 contestants, then -1 means no votes, 0 means 20% (i.e, even split), 1 means 40%, etc.  In week 10, there were were two "splits" before the final vote, and the numbers include all votes for all four finalists, even though in split 2 and the final some contestants were no longer eligible.

Here's the spreadsheet.