The easy way to ielts writing academic Module

A peak/peak(ed)/reach(ed) a peak/reach(ed) the highest point/climb(ed)
to a peak/come(came) first/had a peak/went up to a peak
For example
1. The figure reached its highest point with 64% in 2000.
2. The number of married couples peaked at 78000 in 1980.
Period of stability
A period of stability happens when there is no change in a figure or amount
over a period. Using a variety of words and phrases would help avoid
repetition.
Nouns, verbs, and phrases to describe a period of stability:
A period of stability/a period of no changes/It did not change.
/stabilize(d)/reach(ed) a period of stability/It did not move. /It
shows/(ed) stability. /It remain(ed) stable. /remain(ed) steady
/maintain(ed) the same level
For example
1. The trend witnessed a period of stability until 1996.
2. The number of people traveling by car maintained the same level at
200 million from 1998 to 2002.
Trough/the lowest point
A trough happens when a number, an amount, or a trend goes down to reach
its lowest point.
Nouns, verbs, and phrases to describe a trough:

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A trough/the lowest point/It hit the lowest point. /It reached a trough.
For example
1. The figure had a sharp fall to hit the lowest point, with 32% in 1879.
2. The trend for overseas students reached a trough in 2010.
Fluctuation
Whenever a number or a figure keeps changing and goes up and down, it
fluctuates.
Nouns, verbs, and phrases to describe a fluctuation:
A fluctuation/a variation/fluctuate(d)/vary (varied)/It showed changes.
/change(d)/It was unstable. /It had a period of instability.
/oscillate(d)/oscillation(s)
For example
1. The interest rate oscillated wildly over the given period.
2. The trend for college graduates fluctuated marginally for the past
three years.
Plateau
Plateaus occur when a number stops going up or down and stabilizes for a
while. There are some ways to describe these movements.