-15.23% is the change from 591 to 501
Calculation steps:
[( 501 - 591 ) ÷ 591] x 100 = -15.23%
Formula
Percentage change = [(501 - 591) / 591] x 100
Subtract the new number by the original number
501 - 591 = -90
-90 ÷ 591 = -0.15228426395939088
-0.15228426395939088 x 100 = -15.23%