Figures for people born in Russia and the former USSR states are among the most complicated. The 1991 Census recorded USSR-born people because it was compiled before the collapse of communism. The 2001 Census counted people in various different ways.
In general however, the numbers born in the former USSR went up by 16,000 to about 43,000 in the 10 years to 2001.
About 3,500 of these were born in the Asian territories of the communist block, more than 10,000 in the Baltic states and the vast majority in "European USSR" meaning predominantly Russia, Ukraine and so on.