-3.64% is the change from 660 to 636
Calculation steps:
[( 636 - 660 ) ÷ 660] x 100 = -3.64%
Formula
Percentage change = [(636 - 660) / 660] x 100
Subtract the new number by the original number
636 - 660 = -24
-24 ÷ 660 = -0.03636363636363636
-0.03636363636363636 x 100 = -3.64%