The provided line graph illustrates how many books(measured in million) was bought from three different sources(Bookshops, Supermarket, and Internet) in one European country during a period from 2000 and 2012.
During the period from 2000 and 2004, bookstore, acted as the leading source of book buying, stood at 170 million books initially and experienced a moderate decrease to 160 million in 2004. However, The amount of books from Internet showed a dramatic surge from 110 million in 2000 to 140 million in 2004, surpassing the number of books from Supermarket, which maintained a plateau at around 130 million.
In the later 4 years, the amount of books from bookstore began to decrease significantly, reaching its bottom at 140 million, while supermarkets and internet demonstrated moderate growth across this period, reaching at 140 million and 150 million respectively.
During the last 4 year, supermarket showed a remarkably increase, reaching at 160 million books in 2012 and becoming the main source of book buying. At the same time, After a consistent decrease from 2000 to 2008, the changing amount of bookstore experienced the parallel trend as supermarkets with relatively lower increasing velocity, reaching at 155 million in 2012. Nevertheless, the opposite changing pattern from Internet was observed in last 4 years. The amount of books from Internet decreased considerably to 135 million after peaking at 150 million in 2008.