-83.81% is the change from 661 to 107
Calculation steps:
[( 107 - 661 ) ÷ 661] x 100 = -83.81%
Formula
Percentage change = [(107 - 661) / 661] x 100
Subtract the new number by the original number
107 - 661 = -554
-554 ÷ 661 = -0.8381240544629349
-0.8381240544629349 x 100 = -83.81%