This is the German DAX index where each bar count as one year. It is the opening hours index and not the index future open pre and post the trading sessions.

In 2021, the German DAX index ranged 22% from year low to year high. The chart above is created as an Heikin Ashi chart, thereby given different outcomes of highs and lows than a normal bar chart because of its formula.
The strongest message from this chart is the importantance of a bar's higher low (lower high) which is indicating further development.