Please review my IELTS Writing Task 1

The chart below shows the amount of money per week spent on fast foods in
Britain. The graph shows the trends in consumption of fast foods.
Write a report for a university lecturer describing the information shown below.
You should write at least 150 words.

Two graphs give different information related to three kinds of fast foods. The column diagram indicates the amount of money that the British spent on fast foods per week and the graph illustrates the consumption of fast foods from 1970 to 1990.
In general, high income people spent the highest amount of money to eat fast foods, besides the low income people spent the lowest amount of money to eat these. On the other hands, hamburgers consumption recorded the fastest growth.
Looking at the detail, hamburgers expenditure in high income group is highest with almost 42 pence, the second expenditure is almost 33 in average income group, the expenditure of the last income group is approximately 14. Pizza cost in the high income group is the highest with 20 pence, in the average income and low income group the cost is lower 7 and 12 than the high income group. The fish and chips cost in the low income group are as equal as the high income group with almost 18 pence and they are lower than the average income group 7 pence.

In the detail of the graph, from 1970 to 1990, the hamburgers consumption sharply increased from nearly 100 to almost 550, besides The pizza consumption gradually increased from nearly 50 to 290 in this period. The fish and chips consumption gradually decreased from 300 to 200 from 1970 to 1985 and lightly risen from 1985 to 1990.