Click on possible answers in the right column to hide/show them on the graph. You can also hover over any line to see current value at that time. Graphs will begin to show data one hour after the question has been open. The Historical Trend chart does not display all prices ever reached since it is only updated at discrete time intervals, (hourly/daily/weekly, depending on the date range).
The US YC is the benchmark index with calculations based on US Treasury data posted here:
The calculation will be the 30 year bond rate minus the 3 month T-bill rate. If that value goes below zero, then that will initialize the count towards “inversion.” Therefore, if the YC inverts at any time before the end of 2015 and stays inverted for more than 30 days, that is my definition of “recession.” This inversion doesn’t have to be of constant duration, in other words, “inversion” is defined as occurring within a minimum 30 day window. If there is fluctuation above and below zero, then the 30 day window would start with the first inverted date and end with the last inverted date in 2015. The metric would reset to zero or “no inversion” if more than 30 days elapse without a single inverted day. So, to the nitpickers, if there are only two inverted dates within a 30 day window, that would mean, yes, “inversion” is occurring and there is an impending recession.