While I am unwilling to disclose exact historical traffic metrics for EntropiaForum / PCF at this time, I can tell you that the long-term trend is upwards, both in terms of unique daily visitors as well as daily page views.
This is the case even considering temporary downswings experienced during the CryEngine2 conversion (VU 10) and other major recent EU happenings (i.e. FPC to SDS, EF transition to PCF, launch of new planets, space, etc.).
In other words, PCF is busier than ever before, and the trend of visitors and traffic is pretty steady upwards.
Hope this info helps.