-20.93% is the change from 664 to 525
Calculation steps:
[( 525 - 664 ) ÷ 664] x 100 = -20.93%
Formula
Percentage change = [(525 - 664) / 664] x 100
Subtract the new number by the original number
525 - 664 = -139
-139 ÷ 664 = -0.20933734939759036
-0.20933734939759036 x 100 = -20.93%