-21.3% is the change from 662 to 521
Calculation steps:
[( 521 - 662 ) ÷ 662] x 100 = -21.3%
Formula
Percentage change = [(521 - 662) / 662] x 100
Subtract the new number by the original number
521 - 662 = -141
-141 ÷ 662 = -0.21299093655589124
-0.21299093655589124 x 100 = -21.3%