Just for fun, as of right now (I just got done doing the numbers); there are 26,702 nations on planet Bob. 19,026 of those nations are in alliances, that’s 71% of all nations are in alliances. Now 5,045 nations are one month old as of today, considering that 90% of them wont last, that’s 505 nations that are in the 10% that will continue to exist.

maybe I will build a graph on this month after month.

I don't understand

90% of all nations simulated to date are no longer around.
Using that statistic (despite the fact that it's not consistant in the short-run) kamino is stipulating the number of nations that were created in this month that will be deleted.
Furthermore using the above presuppositions he is commenting on the number of nations that will continue on existing.

What this implies if anything (and I assure you it takes a lot of reasoning to apply this) is that each month a certain amount of "fresh blood" is injected into alliances. Now considering all the constants are valid and apply forever 505 lasting nations will have joined an alliance this month.

What this thread can show is the potential to recruit new and lasting members into an alliance each month.

Interesting. I'd love to see a graph of that...