Showing data isn’t very difficult, but there are many clever and subtle ideas that can change the message and the way a chart is read. What do you want to stress? What do want people to take away? What is your intent in showing these numbers?
The simple decision to have bars point down instead of up draws attention and communicates a message beyond the pure numbers: something is wrong. It’s amazing how loudly and clearly such a simple change can speak.
Reference: When Bars Point Down