The reasons for the yield increases forecast by the experts are not always clear. All three appear to use the UN medium variant for population. Short term variations. The yield projections shown here are averages over 12-32 years. Grain data are better than those for many other foods.
Grain is also a useful proxy for other foods.
500 litres of water are needed to produce a kilo loaf of bread. This can be 2 or 3 times more in badly managed agriculture. Although they may exist, I have not seen graphs which show percentage yield increases and percentage population increases matched in this way against projections of the necessary yield increases - if widespread starvation is to be avoided. It is the 32 year trend line of these averages that is so disturbing. The background to this study.