-27.18% is the change from 688 to 501
Calculation steps:
[( 501 - 688 ) ÷ 688] x 100 = -27.18%
Formula
Percentage change = [(501 - 688) / 688] x 100
Subtract the new number by the original number
501 - 688 = -187
-187 ÷ 688 = -0.27180232558139533
-0.27180232558139533 x 100 = -27.18%