Historically, agriculture has been as important in the development of Australia, as it was in the United States. Australia’s traditional dominance in wheat and sheep continues into the 21st century. Recently Australian agriculture has become increasingly diversified. The considerable expanses of arable land have helped Australia to become a leading world exporter of grains, meats, and wool. Both grains (predominantly wheat and barley) and wool markets around the world are dominated by Australian exports. The market for cattle is more regional but is becoming increasingly important globally, given health concerns about European-produced beef. While only about 6 percent of Australia is suitable for crops and pasture, a considerable amount (60 percent) of the land area is suitable for cattle grazing.