-33.64% is the change from 660 to 438
Calculation steps:
[( 438 - 660 ) ÷ 660] x 100 = -33.64%
Formula
Percentage change = [(438 - 660) / 660] x 100
Subtract the new number by the original number
438 - 660 = -222
-222 ÷ 660 = -0.33636363636363636
-0.33636363636363636 x 100 = -33.64%