For that indicator, The World Bank provides data for Switzerland from 2006 to 2015. The average value for Switzerland during that period was 32.81 index points with a minumum of 31.6 index points in 2012 and a maximum of 34.3 index points in 2007.
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Definition: Gini index measures the extent to which the distribution of income (or, in some cases, consumption expenditure) among individuals or households within an economy deviates from a perfectly equal distribution. A Lorenz curve plots the cumulative percentages of total income received against the cumulative number of recipients, starting with the poorest individual or household. The Gini index measures the area between the Lorenz curve and a hypothetical line of absolute equality, expressed as a percentage of the maximum area under the line. Thus a Gini index of 0 represents perfect equality, while an index of 100 implies perfect inequality.