The economic development of the country has been uneven geographically with the Moscow region contributing a very large share of the country's GDP.[39] There has been a substantial rise in wealth inequality in Russia since 1990 (far more than China and other Eastern European countries).[40][41] Credit Suisse has described Russian wealth inequality as so extreme compared to other countries that it "deserves to be placed in a separate category."[41][42] One study estimates that "the wealth held offshore by rich Russians is about three times larger than official net foreign reserves, and is comparable in magnitude to total household financial assets held in Russia."[40]