Answer:
Sharply between the seventeenth and eighteenth
Step-by-step explanation:
500,000,000 * 2 = 1,000,000,000
200,000,000 + 300,000,000 = 500,000,000
100,000,000 (estimate) * 2 = 200,000,000
Sorry, this is the best I can explain But as you can see between the seventeenth and eighteenth century, most of the number of books printed in Europe.