What year was this?

1. The bikini was first unveiled.

2. Indian Prime Minister Indira Gandhi was assassinated.

3. The Space Shuttle Challenger disaster occurred.

4. Nineteen Eighty-Four: A Novel was first published.

5. Bob Dylan went 'electric'.

6. The first iPhone was released.

7. The first Model-T Ford was built.

8. The French Revolution began with the storming of The Bastille.

9. The Eiffel Tower was completed.

10. Julius Caesar was assassinated.