More or less dooglus updates the chart for five different BTC/fiat pairs if the BTC price is within the top 100 of days, and for each fiat pair he has a specific exchange that he uses and calulates the price for the day at the closing at midnight UT based on the average price per trading volume for that pair on that day. So each time one of the BTC/fiat pairs is within the top 100 days it gets updated, so you see the USD pair is on bitstamp and yesterday, August 4, it traded at 83rd top day ever for USD/BTC at $10,842.51. If it does not trade in the top 100, it does not make the posted chart, and if none of those BTC/fiat pairs are in the top 100 disciplined dooglus does not tend to post anything in this thread. (hahahahahaha - using the word "disciplined" with all due respect)
But what is the purpose of this exercise? Does it help in one way or the other in trading?