Most popular programming languages 1965-2019 (visualised)

[Dennis]

On Friday, 11 October 2019 at 06:30:28 UTC, Ola Fosheim Grøstad 
wrote:
> Assembler and BASIC was much larger in the mid 80s. 4GL should 
> have a fairly strong presence in the late 80s. Etc.
>
> It is most likely based on surveys of big corporations. Most 
> programming happend outside of those.

Do you have a source saying that those languages were more 
popular in the 80s / that most programming happened outside 
corporations?