State X has seen an increase in its arithmetic density. In 1960, the arithmetic density was 91.7 people per square kilometer. By 2005, it had increased to 353.4 people per square kilometer, where it has stayed steady through the present. What determination can be made about State X based on the data?

State X has reached its carrying capacity.

State X has seen an influx of residents inland.

State X has high rates of unemployment.

State X has seen a decrease in its physiological density.

State X has seen a decrease in land availability.