Steve Rattner's Defective Social Security Chart in NYT

Steve Rattner had a series of mostly useful charts in the NYT this morning describing the state of the economy. The major exception is the one on Social Security shown below.

It is not clear what information this chart is supposed to convey. The average annual benefit in 2012 for a retired worker was $14,760 according to the Social Security Administration. It's not clear where Rattner got $23,135. The chart also shows adopting a chained CPI, presumably for adjusting the annual cost of living...