-75.34% is the change from 661 to 163
Calculation steps:
[( 163 - 661 ) ÷ 661] x 100 = -75.34%
Formula
Percentage change = [(163 - 661) / 661] x 100
Subtract the new number by the original number
163 - 661 = -498
-498 ÷ 661 = -0.7534039334341907
-0.7534039334341907 x 100 = -75.34%