$(7)($a$)$ Out of the five given years, in which year was the percentage of fast public chargers outside of China and the U$.$S$.$ the greatest? Discuss in your group before recording your group's answer in the given space.

$($b$)$ Between $2019$ and $2020,$ what was the absolute change in the number of fast public chargers in China?

$($c$)$ Between $2019$ and $2020,$ what was the relative change in the number of fast public chargers in China? Round to two decimal places.

$(8)$ Now that you have examined some details about the stacked bar chart, consider the whole chart. What is the main story being told by this chart? In other words, what main trend$($s$)$ does the chart show? Are there any other possible stories being told? Discuss this with your group members.