-80.6% is the change from 665 to 129
Calculation steps:
[( 129 - 665 ) ÷ 665] x 100 = -80.6%
Formula
Percentage change = [(129 - 665) / 665] x 100
Subtract the new number by the original number
129 - 665 = -536
-536 ÷ 665 = -0.806015037593985
-0.806015037593985 x 100 = -80.6%