-21.88% is the change from 521 to 407
Calculation steps:
[( 407 - 521 ) ÷ 521] x 100 = -21.88%
Formula
Percentage change = [(407 - 521) / 521] x 100
Subtract the new number by the original number
407 - 521 = -114
-114 ÷ 521 = -0.21880998080614203
-0.21880998080614203 x 100 = -21.88%