How many NBA lockouts have there been?

Related questions

1. Why did NBA have a lockout?
2. When did Stern retire?
3. Do you get paid during a strike?
4. When did the NBA start playing 82 games?
5. What does a lockout mean in NBA?
6. Who won the NBA championship in 2009 and 2010?
7. Why was the 2012 NBA season shortened?
8. Whats the difference between a strike and a lockout?
9. How long was the NBA lockout?
10. WHO declares lockout and who declares strike?

Tags

1. #agreement
2. #ratify
3. #collective
4. #players
5. #strikes
6. #league
7. #bargaining
8. #officially
9. #there
10. #national
11. #lockout
12. #since
13. #hockey
14. #three
15. #december
16. #result
17. #stoppages
18. #strike
19. #owners
20. #lockouts