-13.54% is the change from 591 to 511
Calculation steps:
[( 511 - 591 ) ÷ 591] x 100 = -13.54%
Formula
Percentage change = [(511 - 591) / 591] x 100
Subtract the new number by the original number
511 - 591 = -80
-80 ÷ 591 = -0.1353637901861252
-0.1353637901861252 x 100 = -13.54%