-99.85% is the change from 688 to 1
Calculation steps:
[( 1 - 688 ) ÷ 688] x 100 = -99.85%
Formula
Percentage change = [(1 - 688) / 688] x 100
Subtract the new number by the original number
1 - 688 = -687
-687 ÷ 688 = -0.998546511627907
-0.998546511627907 x 100 = -99.85%