Sort:  

Yes, the change was made to close the gap in financial incentives between backup witnesses (especially those near 19) and the top 19. It was changed with the other inflation changes on December 6th with the 16th hardfork.

Cool, thanks for sharing @pfunk!

Correct.

Thanks!

Number for every witnesses can be seen here. Here's one example.

https://steemdb.com/@abit/blocks