-32.11% is the change from 978 to 664
Calculation steps:
[( 664 - 978 ) ÷ 978] x 100 = -32.11%
Formula
Percentage change = [(664 - 978) / 978] x 100
Subtract the new number by the original number
664 - 978 = -314
-314 ÷ 978 = -0.3210633946830266
-0.3210633946830266 x 100 = -32.11%