The OECD member with the lowest income equality measured by the Gini coefficient is Denmark, which is followed by Slovenia, Slovakia and Norway, according to the latest data available to the OECD.

The biggest differences were observed in Chile, Mexico, Turkey and the US.

Slovenia's Gini coefficient, a widely-used measure of statistical dispersion of pay, stands at 0.25 and trails only Denmark (0.249), but it increased somewhat compared to 2011 (0.247).

In a majority of the 34 OECD member states, the differences in income between the richest and poorest population is at the highest level in three decades.

The richest 10% of the population earns 9.6 times more than the poorest 10%, which is significantly more than in the 1980s (7-to-1) and also more than at the beginning of the 2000s (9-to-1).

Slovenia's ratio according to the latest available data stands at 5.4, which ties it at second place with the Czech Republic. Denmark has the lowest ratio, at 5.2.

Difference in asset ownership in the OECD countries are even greater than income differences. The richest 1% of the population held 18% of assets in 2012, while the poorest 40% owned only 3% of total assets, the survey shows.