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I think the Q4 columns are simply stating "at the end of Q4 this is what our number was"

Because Q4 of 2012 has not happened yet, we can't mark a number on the graph, so Q1 which has finished is the best we can do for this year.

That's my understanding of it.

I understand _why_ they did it. But it's still wrong.

The best option would be for them to put in the quarterly numbers for all years, then all bars would represent an equal amount of time.