The graph shows the amount of fast food eaten between 1970 and 1990 in grams per person per week. Overall, the amount of fast food eaten more than doubled.
The amount of fish and chips eaten declined slightly. In 1970, the consumption was about 300g/week. This fell to 220g/week in 1990.
In contrast, sales of hamburger and pizza rocketed. In 1970, very little pizza was eaten - less than 50g/week. This rose to 280g/week by 1990. In the same period, hamburger sales shot up by more than 500%, from 100g/week in 1970 to 500 grams in 1990.
In conclusion, although there was a big increase in the consumption of pizza and hamburger, sales of fish and chips decreased.