Read section 1.1 of the textbook. Use the provided spreadsheet (presenting the data used to create Figure 1.2 from the textbook). Consider Australia, China, USA and another two countries of your choice. 1. For each country calculate the 90/10 ratio in 1980, 1990 and 2014. (3 marks) 2. Describe the differences between countries and the changes over time that you find. (4 marks) 3. Can you think of any explanations for the differences you find? (3 marks)