-79.43% is the change from 661 to 136
Calculation steps:
[( 136 - 661 ) ÷ 661] x 100 = -79.43%
Formula
Percentage change = [(136 - 661) / 661] x 100
Subtract the new number by the original number
136 - 661 = -525
-525 ÷ 661 = -0.794251134644478
-0.794251134644478 x 100 = -79.43%