-57% is the change from 979 to 421
Calculation steps:
[( 421 - 979 ) ÷ 979] x 100 = -57%
Formula
Percentage change = [(421 - 979) / 979] x 100
Subtract the new number by the original number
421 - 979 = -558
-558 ÷ 979 = -0.5699693564862104
-0.5699693564862104 x 100 = -57%