These include several groups of halogenated hydrocarbons containing either chlorine or bromine that are used as solvents or refrigerating agents. The Montreal Protocol, which supplements the 1985 Vienna Convention for the Protection of the Ozone Layer, had been ratified by 196 countries by 2011. By the end of 2010, the organization had completed 1,142 projects (worth $533 million in disbursements) phasing out 70,106 tonnes of potential ozone depleting substances. Another 199 projects are being implemented.