[Steve_Seattle]

How can these numbers be jumping around? I would expect that when each new year goes into the list, it would bump the other years up or down one. But how can the relative rankings keep jumping all over the place?

[lepton]

How can these numbers be jumping around? I would expect that when each new year goes into the list, it would bump the other years up or down one. But how can the relative rankings keep jumping all over the place?

Because the numbers prior to 2000 were adjusted, and the numbers from 2006 pulled their data from one stage of the adjustment process and weren't normalized, giving the whole range after Jan 2000 a jump of at least .15C...and then that data was used to normalize some of the data from the past, so it carried the error back in time.