A rare moment in the history of US markets - no drop by 5%

US indices are close to their record values. In fact, the S&P 500 blue chip index has registered 322 days without experiencing a 5% or more adjustment.
This year, the index has record-breaking closing levels in 47 of the 201 stock exchanges.
Since July of last year, the blue chip index has added 19% of its value without having registered an adjustment of 5 or more percents. And this has happened very rarely in the history of the index.

You may be wondering how historically the market has been presented during these long periods without a decrease of 5% or more.
An answer to this question could be found in the chart below: