-15.06% is the change from 591 to 502
Calculation steps:
[( 502 - 591 ) ÷ 591] x 100 = -15.06%
Formula
Percentage change = [(502 - 591) / 591] x 100
Subtract the new number by the original number
502 - 591 = -89
-89 ÷ 591 = -0.1505922165820643
-0.1505922165820643 x 100 = -15.06%