-80.03% is the change from 671 to 134
Calculation steps:
[( 134 - 671 ) ÷ 671] x 100 = -80.03%
Formula
Percentage change = [(134 - 671) / 671] x 100
Subtract the new number by the original number
134 - 671 = -537
-537 ÷ 671 = -0.8002980625931445
-0.8002980625931445 x 100 = -80.03%