The Soviet Union occupied Lithuania in 1940 , and it enumerated people there by ethnicity from 1959 to 1989 .
Lithuania enumerated people by ethnicity in its 1923 census and in its 1925 census of its Klaipeda region .
The Soviet Union occupied Lithuania in 1940 , and Lithuania enumerated people there by ethnicity from 1959 to 1989 .
Lithuania enumerated people by ethnicity in its 1923 census and in its 1925 census of its Klaipeda region .