-86.6% is the change from 963 to 129
Calculation steps:
[( 129 - 963 ) ÷ 963] x 100 = -86.6%
Formula
Percentage change = [(129 - 963) / 963] x 100
Subtract the new number by the original number
129 - 963 = -834
-834 ÷ 963 = -0.8660436137071651
-0.8660436137071651 x 100 = -86.6%