-1.3% is the change from 538 to 531
Calculation steps:
[( 531 - 538 ) ÷ 538] x 100 = -1.3%
Formula
Percentage change = [(531 - 538) / 538] x 100
Subtract the new number by the original number
531 - 538 = -7
-7 ÷ 538 = -0.013011152416356878
-0.013011152416356878 x 100 = -1.3%