In 2017, 13.2 pounds per person of fresh head lettuce (iceberg, butter, Boston, and Bibb lettuces) were available for domestic consumption, according to ERS’s Food Availability data. Fresh head lettuce has declined 54 percent from its high of 28.6 pounds per person in 1989. In contrast, availability of romaine and leaf lettuces (such as red and green leaf lettuces) increased, reaching 12.5 pounds per person in 2017 from 3.3 pounds per person in 1985 and almost equaling head lettuce. The growing popularity of prepackaged, ready-to-eat salad greens contributed to the rise in availability of romaine and leaf lettuces. ERS annually calculates national supplies available for domestic consumption by summing domestic production, beginning inventories, and imports and then subtracting exports and ending inventories. Per capita estimates are calculated by dividing these national supplies by the U.S. population. The data for this chart come from the Food Availability data series in ERS’s Food Availability (Per Capita) Data System.