An orchard owner recorded the weight, in pounds, of all nectarines that grew on a dwarf nectarine tree during each growing season after the tree's transplantation. The scatterplot shows this weight, in pounds, for each growing season after the tree's transplantation.

The x-axis represents growing season after transplantation, and the y-axis represents weight of nectarines in pounds.

By how many pounds did the weight of nectarines increase from the $3$rd growing season to the $5$th growing season after the tree's transplantation?