Table 2. Percentage of global crop production under different crop yield trajectories.

Crop species	% of global production*	Increasing rate (%)†	Constant rate (%)	Decreasing rate (%)	Upper yield plateaus (%)
Rice	84	19	23	9	33
Wheat	56	5	24	0	27
Maize	71	13	33	20	5
Total rice, wheat and maize	70	12	27	10	21

^*Percentage of global production of rice, wheat and maize, and the three crops together accounted for by the 36 crop–country cases analysed in this study.

^†The 36 crop–country cases were grouped according to the pattern of change in rates of crop yield gains during the 1965–2010 interval and total production was calculated for each group and for each crop.