-0.38% is the change from 523 to 521
Calculation steps:
[( 521 - 523 ) ÷ 523] x 100 = -0.38%
Formula
Percentage change = [(521 - 523) / 523] x 100
Subtract the new number by the original number
521 - 523 = -2
-2 ÷ 523 = -0.0038240917782026767
-0.0038240917782026767 x 100 = -0.38%