What is the approximate carrying capacity of the population? In which year, did the population reach the carrying capacity? About how many years did it stay at carrying capacity? A graph entitled Graph A has year on the horizontal axis, from 0 to 9, and population size on the vertical axis, from 0 to 300 in increments of 50. From year 1 to year 3, the population increased rapidly to 250. From year 3 to year 7, the size remained relatively constant. From year 7 to year 8, the size began to decrease.