-21.11% is the change from 668 to 527
Calculation steps:
[( 527 - 668 ) ÷ 668] x 100 = -21.11%
Formula
Percentage change = [(527 - 668) / 668] x 100
Subtract the new number by the original number
527 - 668 = -141
-141 ÷ 668 = -0.21107784431137724
-0.21107784431137724 x 100 = -21.11%