Why is the Spanish question mark upside down?

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Tags

1. #point
2. #believe
3. #following
4. #upside
5. #exclamation
6. #because
7. #inverted
8. #these
9. #simply
10. #marks
11. #spanish
12. #reader
13. #proper
14. #statement
15. #punctuation
16. #question
17. #upcoming
18. #allows