 Between 1991 and 1999 under the government of Carlos Menem, as part of one of the world's largest privatization programs covering a range of sectors, water and sanitation concessions with the private sector were signed in 28% of the country's municipalities covering 60% of the population.The highest profile concession was signed in 1993 with a consortium led by the French firm Suez for the metropolitan area of Buenos Aires.After the 2001 economic crisis, under the government of Néstor Kirchner, many concessions were renegotiated.