Bloomberg Still Wangling for Tufte Award

As evidenced by the following chart, Bloomberg is still wangling for the Tufte award for graphical opacity. Can someone explain the following chart in a way that makes sense? How is it that downward revisions to S&P companies’ earnings were lowest during the credit crisis, and highest during the go-go years?

bberg-sp-tufte

The original article/chart is here.

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