Since the mid 2000s, AMD's server market share has been in a steady decline, going from owning a quarter of the entire market in 2006 to not even 1% in 2014. Recently, AMD's fortunes have begun to shift and the CPU designer is making a comeback with their new server line up Epyc. In Q2 of this year, AMD announced it had finally increased their market share in the server to more than 1%.
https://www.notebookcheck.net/AMD-s-server-marketshare-hits-1-for-the-first-time-in-4-years.321130.0.html