I want to know the answer to the following question:
By what percentage did the world's per-capita gross domestic product grow by during the 20th century?
All the background I'm provided with is that "Over the course of the 20th century, the world's per-capita gross domestic product grew by a factor of five, much more than all earlier centuries combined (including the 19th with its Industrial Revolution).". Is that enough to answer the question?
Answer: yes