The supplied graph provides data on the trends in consumption of three fast food types between 1970 and 1990.
As is presented in the graph that these fast food consumption leapt year by year – 1985 years in particular. The sum of these types of food was nearly 450 grams each week in 1970, however, the consumption of those food in 1990 years was 1000 grams/week. This means that the demand of these fast food types escalated abruptly within 20 years.
In 1970, pizza was consumed massively, which was just over 300 grams/week. However, this figure deteriorated marginally up to 1990, thereby coming the point of 200 grams per week.
As for hamburger, this food consumption in 1970 was the lowest point, nearly 50 grams/week, among three types of fast food. But its trend soared modestly and became the second most consumed food. In 1990, it was eaten almost 300 grams/week.
In terms of Fish and Chips, that dish consumed in 1970 was just below 100 grams/week. After that, the figure of this food skyrocketed dramatically and reached 500 grams/week in 1990, which was the highest point among these dishes over the period of 20 years.