-73.72% is the change from 978 to 257
Calculation steps:
[( 257 - 978 ) ÷ 978] x 100 = -73.72%
Formula
Percentage change = [(257 - 978) / 978] x 100
Subtract the new number by the original number
257 - 978 = -721
-721 ÷ 978 = -0.7372188139059305
-0.7372188139059305 x 100 = -73.72%