0.9 (10/1972 - 10/1979)

0.9 (10/1979 - 10/1983)

1.0 (09/1983 - 06/1988)

1.1 (08/1980 - 06/1988)

1.1 (07/1976 - 08/1982)

1.1 (09/1978 - 09/1979)

1.2 (08/1979 - 06/1983)

1.4 (08/1979 - 06/1983)