The following table contains data compiled by the Organisation for Economic Co-operation and Development (OECD). The data reflects the average annual percentage change in real household income by income group from the mid-1980s to the late-2000s for five OECD countries. For each of the listed countries, average annual real income increased for the overall population, as is shown in the “Total Population” column, but the numbers vary somewhat for the top 10 percent and bottom 10 percent of income earners within each country. Based on this data, explain what should have happened to the Gini coefficient for each of these countries during this timeframe.

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Country Australia Belgium Japan Spain Total Population 3.6 1.1 0.3 3.1 Bottom 10 percent 3.0 1.7 -0.5 3.9 Top 10 percent 4.5 1.2 0.3 2.5