Noun phrases
an increase a surge a rise a jump a leap | a decrease a decline a drop a tumble a plunge | at a similar level a steady trend maintained stability a period of stability | a fluctuation an oscillation |
Verb phrases
increased surged rose soared rocketed | decreased declined plunged tanked sunk | stabilized remained unchanged remained static stayed the same | fluctuated oscillated |
See my model answers
www.ieltsanswers.com/model-answers-past-questions-reports.html