Everything's in short supply; I don't remember Green being in unusually short supply (on the days when it is available at all), and Wikipedia sa "It is much more nutritious and palatable than the red and yellow varieties". But my analysis suggests it forms only 1/240 of the diet - far less then your 1/3.
Also, I don't believe their population is declining. Part of the point, surely, is that things just keep getting worse - that they have got to the situation depicted because their population keeps growing.
Furthermore you would need a massive excess of death over birth to get Soylent Green available one day in 5, or one day in 3. For each person who lives 1/4 on Soylent Green, say, one other person has to die every 960 days. Their population problem would be rapidly resolving itself if that was the case.
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Also, I don't believe their population is declining. Part of the point, surely, is that things just keep getting worse - that they have got to the situation depicted because their population keeps growing.
Furthermore you would need a massive excess of death over birth to get Soylent Green available one day in 5, or one day in 3. For each person who lives 1/4 on Soylent Green, say, one other person has to die every 960 days. Their population problem would be rapidly resolving itself if that was the case.