[Spoilers] Fintourist and Old Harry have nothing to see here

[Old Harry]

Can someone who knows tell me if I've got this right:

Known Tech Bonus changed to 25 (up from 30), enabled by Map Trading (so there is no Known Tech Bonus until you research Writing).The known tech bonus is multiplied by the number of techs that you have that enable map trading.

Writing enables Map trading, no longer enables OB.
Paper enables Map trading, Tech Trading. Requires Metal Casting as mandatory prerequisite. No longer requires Literature or Code of Laws.
Corporation enables Map Trading.
Scientific Method enables Map Trading.
Steam Power enables Map Trading.
Electricity enables Map Trading.

So once we get Writing we get a bonus on beakers of
- 25*[civs we've met with that tech]/17 %
Once we have Writing and Paper we get a bonus on beakers of
- 50*[civs we've met with that tech]/17 %
Once we have Writing, Paper and Corporation we get a bonus on beakers of
- 75*[civs we've met with that tech]/17 %
Once we have Writing, Paper, Corporation and Scientific Method we get a bonus on beakers of
- 100*[civs we've met with that tech]/17 %
etc until the bonus is 150%...

So it's not going to make much of a difference until we've got paper and met everyone.

Does the /17 change as civs get eliminated? So when we get paper it would be 50*[civs we've met with that tech]/[number of civs still alive] %