This is my writing task 1 essay (from book IELTS 8). Pls! help me check this. Thanks for your comment

The graphs show the changes of annual expenses in a specific school by three different years 1981, 1991 and 2001.
General speaking, the teachers’ salaries were the biggest payments with 40%, 50% and 45% in 1981, 1991 and 2001, respectively. Whereas, the smallest cost was insurance with 2%, 3% and 8% in turn of years 1981, 1991 and 2001.
From 1981 to 1991, there is a dramatic decline of furniture and equipment expense from 15% to 5%. But this kind of cost rose significantly to 23% in 2001. In the contrary, the resources payments increased gradually by 5% between 1981 and 1991 then dropped off to 9% in 2001. Whist, the workers’ salaries hold a downward trend with 28% in 1981, then 22% in 1991 and after that 9% in 2001.
In conclusion, the first position in expenses is hold by the teachers’ salaries and the last is the position of insurance payments.
(153 words)