 Complete the following phrase:  Several Soviet five-year plans did not take up the full period of time assigned to them: some were pronounced successfully completed earlier than expected, some took much longer than expected, and others failed altogether and had to be abandoned. Altogether, Gosplan launched thirteen five-year plans. The initial five-year plans aimed to achieve rapid industrialization in the Soviet Union and thus placed a major focus on heavy industry. The first five-year plan, accepted in 1928 for the period from 1929 to 1933, finished one year early. The last five-year plan, for the period from 1991 to 1995, was not completed, since the 