-16.2% is the change from 821 to 688
Calculation steps:
[( 688 - 821 ) ÷ 821] x 100 = -16.2%
Formula
Percentage change = [(688 - 821) / 821] x 100
Subtract the new number by the original number
688 - 821 = -133
-133 ÷ 821 = -0.16199756394640683
-0.16199756394640683 x 100 = -16.2%