-3.98% is the change from 528 to 507
Calculation steps:
[( 507 - 528 ) ÷ 528] x 100 = -3.98%
Formula
Percentage change = [(507 - 528) / 528] x 100
Subtract the new number by the original number
507 - 528 = -21
-21 ÷ 528 = -0.03977272727272727
-0.03977272727272727 x 100 = -3.98%