[beardyw]

It just happens that a few days ago I found that I had kept nearly every P60 I ever got in over 40 years. P60 is a UK tax summary for a year with "do not destroy" on it. I think I did pretty well.

Obviously, as anyone would, I stuck the income figures into a spreadsheet with cost of living figures [1] and got a chart. What came out was a chaotic mess of ups and downs.

Good luck predicting that.

[1] My first annual salary was just over £1,000 a year. Without cost of living it would have made no sense.