This report looks at the technical development of Bitcoin and the active community of open-source developers who update, maintain, and enhance the Bitcoin code and its greater ecosystem.

Here's a direct download (PDF):

Developers of Bitcoin
https://assets-global.website-files.com/614e11536f66309636c98688/63208342664438223226c3de_NYDIG%20-%20Developers%20of%20Bitcoin%202022.pdf