You'll need to go to one of the external sites for that. Boincstats can show you your WCG stats, as well as those for other projects. The page at https://boincstats.com/en/stats/15/user/detail/973286 shows that you have accumulated more credit than 98.66404% of all World Community Grid Users, for example.

Thank you Apis Tintinnambulator, that site is so full of numbers, but it is very useful once you get used to it. :)

Thank you too Sgt. Joe, your instructions were very helpful once I learned to navigate that page and to do the math, but I still hope someone at WCG would code it into WCG stats page so everyone interested in that information shouldn't need to go to other site and start clicking around and to play with calculator... (you surely did some clicking for me Sgt. Joe, I appreciate it!). With your examples I was able to verify my findings and it seems you'll need average daily credit of BOINC points around 19,800 to "get" the "gold badge" (top 1%), around 5,700 points for "silver badge" (top 5%), and like you said 1,130 points for "bonze badge" (top 25%). I realise these figures are supposed to change by the time. It should be noted that WCG stats page shows rather useless value of all time average daily points while BOINC Manager software show recent value which is needed to evaluate the current level of the calculation power donated.

Thank you both for quick replies, now I know what those numbers really mean (recent average credit), and it seems I'd get the silver badge, wow! :)