Hey DevidedByZero,
thank you very much for your feedback. I’d be happy to briefly explain the approach that I’m currently using to calculate the market value:
- The one value that is displayed at top level is calculated as follows: The last 8 quarters are considered. Per quarter (90 days each) the median (not average) is calculated to smooth out outliers. These median values are now combined with a weighted average. The further in the past the quarter lies, the less it is weighted.
- The data points of the graph above the list are calculated analogously to this procedure, except that the last 24 months (30 days each) are used as the basis for the calculation instead of a quarterly view.
- The values divided by years below the chart are calculated in a simple way without weighted averages. Here the median value (not average) of all prices within the time span is calculated to smooth out any high or low outliers.
I appreciate any feedback from you on the procedure and welcome any suggestions for improvement so that we can further refine the algorithm in the future. 
