Microprocessor speeds

[optimizer]

I haven't kept track of processor speed improvements over the years. I suppose I haven't even bothered shopping for a new CPU simply as I'd have to figure out the CPU speeds.

So, does anyone know of a chart that shows processor percentage speed improvements, possibly by date, both Intel and AMD and any other important markers?

The computer I'm comparing from is probably 2003, Intel Celeron 1.8GHz (possibly 845 chipset - unsure what kind of Celeron chip that makes it?) and I want to see where chips have gone from this over the years. What percentage speed increases over the years.

Is it as simple as looking at the GHz, or is there a lot more to comparing them than there used to be.

Thanks