-20.06% is the change from 668 to 534
Calculation steps:
[( 534 - 668 ) ÷ 668] x 100 = -20.06%
Formula
Percentage change = [(534 - 668) / 668] x 100
Subtract the new number by the original number
534 - 668 = -134
-134 ÷ 668 = -0.20059880239520958
-0.20059880239520958 x 100 = -20.06%