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After road, water, >then rail,>then pipeline are the most chosen one. ( this format is not suggested)
After 1978 (,)there was a gradual decreased
In water ways(,) there was a sharp
1978-1986 then (than) from 1990-1994.
Overview is missing , in such case band score can’t go beyond band 5 in Task achievement. Make use of punctuation marks and adjust word count accordingly after adding overview.