-21.85% is the change from 691 to 540
Calculation steps:
[( 540 - 691 ) ÷ 691] x 100 = -21.85%
Formula
Percentage change = [(540 - 691) / 691] x 100
Subtract the new number by the original number
540 - 691 = -151
-151 ÷ 691 = -0.21852387843704776
-0.21852387843704776 x 100 = -21.85%