-75.3% is the change from 668 to 165
Calculation steps:
[( 165 - 668 ) ÷ 668] x 100 = -75.3%
Formula
Percentage change = [(165 - 668) / 668] x 100
Subtract the new number by the original number
165 - 668 = -503
-503 ÷ 668 = -0.7529940119760479
-0.7529940119760479 x 100 = -75.3%