I had the same confusion.

One of the key things I think between the 3 games is whether communication beforehand helps (in single shot games).

In PD communication doesn’t really help much as you there is little reason to trust what the other person.

In SH communication should be able to solve your problem as S-S is optimal for both players.

In BotS communication which results in agreement can at least be trusted as co-ordinating is optimal for both players. Choosing which option to co-ordinate on is another matter.

(assuming you’ve included the pleasure of spiting the other person etc. in the payoff matrix)

It’s worth noting that the R-squared value for a linear trend-line for 2000-2019 data has R2=0.07 so a constant prediction of 750k acres would only be marginally less accurate. (I think your excluding 2020 graph also excludes 2019 but the story doesn’t change much either way)

It looks like up until 2016 everything was fairly constant and since then 3 out of 4 years have been bad.