Some people believe that sport is an essential part of school life for children, while others feel it should be purely optional. Discuss both sides and give your opinion.

The bar chart illustrates how much annual sales have changed in different global items, which include games software, DVD/video and CDs between 2000 and 2003. Units are measured in billions.

Overall

, the amount of money on games software and DVDs or videos exhibited upward trends throughout the period,

while

compact discs, which took the lead during these years, showed a slight decline. 
In 2000, the earnings of game applications per year were about 15, and it increased gradually by approximately 1 in the following years.

Then

, the profit of

this

product continued to rise steadily to the year 2003, which saw a moderate rise to around 18 and

then

grew to just under 20

at the end

of the period.
 In terms of videos and DVDs, in the first year of the 21st century, the sales amount was roughly 18, only less than half of the sales for CDs, at roughly 34.

However

, it showed significant growth for the

next

couple of years, from about 21 in 2001 to around 25 in 2002. It is worth noting that by 2003 the amount of money for DVDs or videos reached a peak of more than 30 , almost the same as those for CDs.

Furthermore

, it

also

saw the greatest difference in the software that came in

last

, by 11.