-76.55% is the change from 661 to 155
Calculation steps:
[( 155 - 661 ) ÷ 661] x 100 = -76.55%
Formula
Percentage change = [(155 - 661) / 661] x 100
Subtract the new number by the original number
155 - 661 = -506
-506 ÷ 661 = -0.7655068078668684
-0.7655068078668684 x 100 = -76.55%