Ukraine vs Poland by GDP 1990-2012
So few basic data about Ukraine:

Population: 45.59 (fall from 51.89 in 1990)
GDP 2012: 176.3 billion USD | GDP 1990: 81.46 billion USD
GDP per capita 2012: 3.866 thousands USD | GDP per capita 1990: 1.569 thousands USD


Few data about Poland:

Population: 38.54 ( 38.11 in 1990)
GDP 2012: 489.8 billion USD | GDP 1990: 64.55
GDP per capita 2012: 12.707 | GDP per capita 1990: 1.693 thousands USD
Note the per capita data difference.