a substantial proportion

A large and significant part or share of something.

writing-task-1writing-task-2speakingWork and economyGovernment and society

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Useful for describing data proportions in Task 1, discussing demographic or economic segments in Task 2, and in Speaking Part 3.

A substantial proportion of young adults in the survey reported experiencing anxiety.
In many countries, a substantial proportion of government spending goes to healthcare and education.
The pie chart illustrates that a substantial proportion of energy comes from fossil fuels.

a substantial proportion of: A substantial proportion of the workforce is employed in the service sector.
a substantial proportion of the population: A substantial proportion of the population lives in urban areas.
account for a substantial proportion: Renewable sources now account for a substantial proportion of electricity generation.
grow to a substantial proportion: The informal economy has grown to a substantial proportion in some developing countries.

a large share: Slightly less formal but common in data descriptions.
a significant portion: Common synonym with similar academic tone.
a considerable amount: More general; used for uncountable nouns like time or money.

A substantial proportion of students are from abroad. to A substantial proportion of students is from abroad.. Use singular verb 'is' because the subject is 'a proportion' (singular), not 'students'.
There is a substantial proportion between males and females. to There is a substantial difference in the proportion of males and females.. 'Proportion' refers to a part of a whole, not a difference; use 'difference' for comparison.
A substantial proportion less than 10 percent. to A substantial proportion is less than 10 percent.. The sentence needs a main verb; add 'is'.