Commonwealth of Nations
The land area of the Commonwealth nations is about , or about 21% of the total world land area. The three largest Commonwealth nations by area are Canada at , Australia at , and India at . In 2016, the Commonwealth members had a combined gross domestic product of over $9 trillion, 78% of which is accounted for by the four largest economies: United Kingdom ($2.629 trillion), India ($2.256 trillion), Canada ($1.529 trillion), and Australia ($1.258 trillion).
Head of the Commonwealth
By 1949, the British Commonwealth was a group of eight countries, each having George VI as king. India, however, desired to become a republic, but not depart the Commonwealth by doing so. This was accommodated by the creation of the title "Head of the Commonwealth" for the King and India became a republic in 1950. Subsequently, many other nations including Pakistan, Sri Lanka, Malaysia and Singapore ceased to recognise the monarch of the United Kingdom as their respective head of state, but as members of the Commonwealth of Nations recognised the British monarch as Head of the Commonwealth.