-79.88% is the change from 671 to 135
Calculation steps:
[( 135 - 671 ) ÷ 671] x 100 = -79.88%
Formula
Percentage change = [(135 - 671) / 671] x 100
Subtract the new number by the original number
135 - 671 = -536
-536 ÷ 671 = -0.7988077496274217
-0.7988077496274217 x 100 = -79.88%