Maybe my math is off, but I have the high at 4818,62 on the 24th of January and the low on the 24th of February at 4114,65.
That's a difference of 703.97 points and a % change of 703.97 / 4818,62 = 14.6 %.
NDX was well below 20 %, though, at 21.8 % down from high to low.
Any thoughts moving...