since I have to write a paper on transformation/transition processes in the baltic states (Estonia, Lithuania and Latvia), I would like to analyze GDP data from 1988 (shortly before the end of the soviet union) until now. I already checked eurostats, the world bank and OECD databases. Unfortunately I couldn't find any GDP data for these countries for the period from 1988-1994.
I would highly appreciate recommendations for other databases, that might contain the data I am looking for.