in the period of October to December, 1992
in 1980 and 2000/ in the years 1980 and 2000
between 1974 and 2002/ between the time period of 1974 and 2002
over the period 1990 to 2000
during the period from 1990 to 2000
during this 25-year period
throughout/for ten years(from 1990 to 2000)
