In 1976 the Council on the Environment of New York City established the Greenmarket program, which provides regional small family farmers opportunities to sell their fruits, vegetables and other farm products at open-air markets in city public squares. The Greenmarket program manages 45 markets in the five boroughs. More than 100 New York City restaurants source their ingredients from Greenmarket farmers each week; Greenmarket farmers also annually donate about 500,000 pounds of food to City Harvest and other hunger relief organizations each year. The most famous location is the Union Square Greenmarket, held Monday, Wednesday, Friday, and Saturday between 8 a.m. and 6 p.m. year-round. The market has 250,000 customers a week who purchase 1,000 varieties of fruits and vegetables at the market.