Major improvements were made from the late 1970s until early in the 1990s.
I have seen a major improvement in just the last year.
To his way of thinking, that was a major improvement.
A small price to pay, after all, for a major improvement.
That knowledge, they said, can lead to major improvements in care.
After that, a year later, they made a couple of major improvements to the design.
However, the club saw major improvements over the first season.
But hey, its a major improvement from anything he has done so far.
A major improvement is required in the administration of the security guard program.
There were no major improvements in the standard of living.