IELTS Academic Writing Task 1 Practice Test 2026 - Free IELTS Writing Practice Questions and Study Guide

This item tests how to name a trend that stops changing and stays at a similar level. Levelled off is used when a category changes earlier but then flattens out, so the values become stable for the rest of the period. That’s why it fits an unchanged category best: it conveys that the situation has ceased to move and holds steady.

Increased or decreased describe directions of change, so they imply the category is still moving. Remained constant would be correct only if the value truly stayed the same from start to finish without any variation; if there was any prior movement before the stabilization, levelled off communicates that nuance more accurately.