-1.88% is the change from 531 to 521
Calculation steps:
[( 521 - 531 ) ÷ 531] x 100 = -1.88%
Formula
Percentage change = [(521 - 531) / 531] x 100
Subtract the new number by the original number
521 - 531 = -10
-10 ÷ 531 = -0.018832391713747645
-0.018832391713747645 x 100 = -1.88%