-20.82% is the change from 658 to 521
Calculation steps:
[( 521 - 658 ) ÷ 658] x 100 = -20.82%
Formula
Percentage change = [(521 - 658) / 658] x 100
Subtract the new number by the original number
521 - 658 = -137
-137 ÷ 658 = -0.20820668693009117
-0.20820668693009117 x 100 = -20.82%