I know that since ~2004, Moore's law stopped working for CPU clock speed.
I'm looking for a graph showing this, but am unable to find it: most charts out there show the transistor count or the capacity per year.

Where can I find some data showing the CPU frequency of computers (anything is fine, personal computers, servers, laptops, ...) from the last few decades to today?  

Raw data that I can plot myself would be fine as well (hum, probably even better).