 7 projects were divestitures, 10 were concessions and 3 were greenfield projects in wastewater treatment plants.The Socialist Presidents Ricardo Lagos (2000–2006) and Michelle Bachelet (since 2006) maintained the basic institutional structure of the sector established under previous governments based on private service provision, means-targeted subsidies and regulation by a public, autonomous regulator.In 2011, the state holding company Corfo sold its stakes in the three largest water companies—Aguas Andinas, Esval and Esbio—on the stock exchange, primarily to individual local and foreign shareholders.