Statistics for coverage of different software repos?

[Samuel Schmidt]

Hello everyone,

Are there are any statistics or similar information about the amount of 
packages covered in Guix compared with (specialized) software repos?
As an end result I am imagine something like: 
"80% of the 300 packages in melpa are also packaged in the guix-main channel"
"2% of the packages in CRAN are also available in the guix-main channel"
"100% of the packages in CRAN are also available in the Guix-cran channel"

I am aware of https://repology.org, but has someone maybe already tried to 
gather data more focused on Guix?

Thanks to everyone taking the time to answer,

Samuel