In 2004 industry accounted for about 20 percent of the gross domestic product (GDP), and less than 10 percent of the labor force worked in industrial production. As a portion of the GDP, the manufacturing sector has contracted since the 1980s. The United Nations embargo of 1994 put out of work most of the 80,000 workers in the assembly sector. Additionally, the years of military rule following the presidential coup in 1991 resulted in the closure of most of Haiti's offshore assembly plants in the free zones surrounding Port-au-Prince. When President Aristide returned to Haiti, some improvements did occur in the manufacturing sector.