-71.86% is the change from 668 to 188
Calculation steps:
[( 188 - 668 ) ÷ 668] x 100 = -71.86%
Formula
Percentage change = [(188 - 668) / 668] x 100
Subtract the new number by the original number
188 - 668 = -480
-480 ÷ 668 = -0.718562874251497
-0.718562874251497 x 100 = -71.86%