The narrowing of differentials was due to the reduced income of high-income and medium-income groups and the slightly growing income of low-income groups.
The income level of the population's highest-income decile went down by one per cent in real terms from 2013 to 2014. The income level of the lowest-income decile rose by 0.3 per cent, the data show.
The real income of the whole population diminished by 0.4 per cent.
The Gini coefficient was at its largest in 2007, compared with which it was over two percentage points smaller in 2014.
Compared with 1995, the Gini coefficient has grown by around five percentage points, most of which is caused by income differentials growing fast in the late 1990s.