[yablak]

Couldn't help myself and ran a quick analysis:

https://colab.research.google.com/drive/1tstVoKkVP_8B7dTOofa...

nice plot at the bottom.

rank correlation between GDP and life expectancy (child mortality would have been maybe a bit better). uses a 20 year window in both directions per year. bootstraps for 5% and 95% quantiles of the rank correlation.

there looks to be a max around 1992, and steady downhill in correlation since then.

this seems unlikely to be an artifact of the analysis, though 1992 is eerily close to 20 years from the last date. 2013 is the last year where we have at least 15 years total symmetriclaly around the given year to include in the correlation for that year.