The G20 membership comprises a mix of the world’s largest advanced and emerging economies, representing about two-thirds of the world’s population, 85 per cent of global gross domestic product and over 75 per cent of global trade.
The members of the G20 are Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Republic of Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the United Kingdom, the United States and the European Union.
Each year the G20 president invites several guest countries to participate in G20 events and contribute to the agenda. G20 members engage with guest countries and other non-member countries to ensure the G20 reflects a broad range of international opinion. In 2014 Australia welcomes Spain as a permanent invitee; Mauritania as the 2014 chair of the African Union; Myanmar as the 2014 Chair of the Association of South-East Asian Nations (ASEAN); Senegal, representing the New Partnership for Africa's Development; New Zealand; and Singapore.
The work of G20 members is supported by several international organisations that provide policy advice.
The G20 also regularly engages with non-government sectors. Engagement groups from business (B20), civil society (C20), labour (L20), think tanks (T20) and youth (Y20) are holding major events during the year, the outcomes of which will contribute to the deliberations of G20 leaders.
The G20 Presidency rotates annually according to a system that ensures a regional balance over time. Reflecting its nature as an informal political forum, the G20 does not have a permanent secretariat. Instead, the G20 president is responsible for bringing together the G20 agenda in consultation with other members and in response to developments in the global economy.
To ensure continuity, the presidency is supported by a “troika” made up of the current, immediate past and next host countries. During Australia’s presidency, the members of the G20 troika are Australia, Russia and Turkey.
Previous hosts of the G20 Leaders' Summit were the United States (in 2008 and 2009), the United Kingdom (2009), Canada (2010), the Republic of Korea (2010), France (2011), Mexico (2012) and Russia (2013).