Timing the 5-Year Treasury Note Yield’s Return to Normal

The following chart shows the natural log of the 5-year yield. When using natural logs, constant exponential growth is seen as a straight line. I have added two such straight lines in red for your amusement.

At its current yield of just 0.71%, at what point did it ever become abnormal? After all, its natural log is currently centered between the two trend lines. What could be more normal than that?