After many, many days of learning how to write macros in Excel and cleaning up a lot of data, I finally have the desired result: A timeline of where Jehovah's Witnesses have been active since 1926.
There are some notes:
1) "Korea" was assumed to be both North and South Korea up until 1950. (I chose 1950 because that is the same year Russia and other communist countries went "banned").
2) Morocco and Western Sahara are considered as one.
3) In the years previous to 1947, I had to read the yearbook reports and make an educated guess as to whether I should include in the report or not. My requirements were: Not banned, report was for an entire year if there was more than one witness in the land, reports were official and not second hand. This disqualified many places, so that in 1943 there were very, very few places in the world where Jehovah's Witnesses freely preached.
That being said:
Here's the video:
https://youtu.be/A5KvUVWR_vI
At first it loops through the entire years very quickly, then gives you 2 seconds per year to examine.
Enjoy!
When I achieve getting all of the YB data into Excel, there will be other maps like these!