what are the most common stream ciphers algorithms? say that we have an unknown stream cipher which output bytes and which have more than 10 years of existence. What can be the most probable algorithms if we consider the most 'populars' stream cipher algorithms?

In order to find the most 'popular' stream ciphers, where can I find some statistics about the most implemented stream ciphers since 2000?
By far, RC4 is the most popular stream cipher that's been around for 10+ years.  ChaCha20 has just turned 10, and is now becoming popular, but was essentially unheard of 10 years ago.