Test Answer Key The graph shows the number of acres, in millions, of farmland in the United States from 1975 to 2008 U. S. Farmland Area 1,080 1,060 1,040 1,020 1,000 Acres (in millions) 960 940 920 900 1975 1980 1985 1990 1995 2000 2005 2010 Years Which statement describes the average rate of ahange of the graph? . The number of acres of farmland in the United States decreases by 0.21 million each year. The amount of farmland in the United States decreases by 4.8 million acres each year. The time it takes the farmland in the United States to decrease by 160 acres is 33 years. Every 5 years, the amount of farmland in the United States decreases by 20 acres​