The three pie charts show the changes in annual spending by a particular school in 1981, 1991, and 2001.

The diagrams compare the expenditure of the school in 1981, 1991, and 2001.

Overall

Linking Words

, the components were divided into several parts which are

salaries

Use synonyms

, resources, and

insurances

Fix the agreement mistake

insurance

show examples

.

Firstly

Linking Words

, the

salaries

Use synonyms

were the greatest proportion over 20 years, and

this

Linking Words

have

Unnecessary verb

apply

show examples

included both teachers' and other workers'

salaries

Use synonyms

. By 1991, the

amount

Change the quantifier

number

show examples

of

salaries

Use synonyms

reached up to 72% which was more than half of all spending at that time.

Secondly

Linking Words

, the spending

of

Change preposition

on

show examples

the

Correct article usage

apply

show examples

resources

were fluctuated

Change to the active voice

fluctuated

show examples

between 1981 and 2001.

According to

Linking Words

the charts, non-human resources held 30% of all

expenditure

Fix the agreement mistake

expenditures

show examples

.

However

Linking Words

, in 1991, the cost of

resorces

Correct your spelling

resources

began to decrease to 25%, and it

had

Unnecessary verb

apply

show examples

increased again after a decade.

Lastly

Linking Words

, insurance, the smallest part of the spending, had

Correct article usage

a slightly

show examples

slightly

Change the word

slight

show examples

increase

Change the verb form

increased

show examples

every 10 years. It

was

Unnecessary verb

apply

show examples

started at 2% and

increase

Wrong verb form

increased

show examples

to 3% and 8% in 1981, 1991, and 2001 respectively. In summary, there were various differences

of

Change preposition

in

show examples

expenditure proportion between 1981 and 2001.

However

Linking Words

, the

salaries

Use synonyms

were the largest cost to the school of all time.