-15.16% is the change from 521 to 442
Calculation steps:
[( 442 - 521 ) ÷ 521] x 100 = -15.16%
Formula
Percentage change = [(442 - 521) / 521] x 100
Subtract the new number by the original number
442 - 521 = -79
-79 ÷ 521 = -0.15163147792706333
-0.15163147792706333 x 100 = -15.16%