-80.77% is the change from 671 to 129
Calculation steps:
[( 129 - 671 ) ÷ 671] x 100 = -80.77%
Formula
Percentage change = [(129 - 671) / 671] x 100
Subtract the new number by the original number
129 - 671 = -542
-542 ÷ 671 = -0.8077496274217586
-0.8077496274217586 x 100 = -80.77%