There are more than 2 ways to do it, depending on your charting service...............................
Time & sales, say,in a 60 minute time frame[I prefer my data on charts, mostly, so see next line]
10 year candlecharts, for example 10 years with 10 yearly[ or more quarterly]candles;
or 10 years worth of monthly candles[meaning 120 candles... ]It maybe wise, to look for averages,or mode on 10 years worth of daily candles, but it takes more time.