-81% is the change from 679 to 129
Calculation steps:
[( 129 - 679 ) ÷ 679] x 100 = -81%
Formula
Percentage change = [(129 - 679) / 679] x 100
Subtract the new number by the original number
129 - 679 = -550
-550 ÷ 679 = -0.8100147275405007
-0.8100147275405007 x 100 = -81%