A new chart by Asymco analyst Horace Dediu has revealed that while PCs have always sold significantly better than Mac computers, the ratio of sales has dropped precipitously since its peak in 2004 and now stands at the most competitive range Apple has achieved since 1985. The figures paint a picture of two simultaneous factors at work: the increasing popularity of Macs, along with the decline of the traditional desktop (and mostly Windows-running) PC.