The link to The Conversation below, provides a useful summary of the G20 and its member economies, e.g.

The G20 economies represent 65% of the world’s population, 79% of world trade, 84% of the world economy and 77% of world carbon emissions.

Australia rates number 3 in GDP per capita based on purchasing power parity.

As a percentage of GDP, Australia has a relatively low level of debt compared to other G20 economies.

Along with Canada,UK and Germany, we are the only G20 economies with a AAA credit rating.

Australia and Canada have the lowest corruption rating amongst the G20 countries.

John Menadue.

http://theconversation.com/the-g20-economies-explained-in-12-charts-33887