-80.75% is the change from 670 to 129
Calculation steps:
[( 129 - 670 ) ÷ 670] x 100 = -80.75%
Formula
Percentage change = [(129 - 670) / 670] x 100
Subtract the new number by the original number
129 - 670 = -541
-541 ÷ 670 = -0.8074626865671641
-0.8074626865671641 x 100 = -80.75%