Say, X months after pollination, the green (fresh) yield is Y1 kg/vine; X+1 months after pollination, the green yield is Y2 kg/vine; & say, X+3 months after pollination, the green yield is Y3 kg/vine.
[You may use stage of growth/maturity or other alternatives, instead of X months after flowering. You may use comparison or generic trend or kg-range instead of kg-average figures.]