Bar charts don't always show time. the often only compare numbers.
If x axis is time, you can write it as what we did in line graph.
Compre the bars. where time or items.
Paragraph 1 - paraphrase the question:
Paragraph 2-overview 2 sentences, 2 main points:
First make a very general comparison. No details.
Similary ...
It is clear that
brand
the biggest rises
Paragraph 3:
- details (numbers)
- Compare
double the numeber of
reaching 450 million units
whereas
figures fell by approximately 200 million untis
Paragraph 4 changes over time :
sold worldwide
the biggest rises
declining sales
respectively