-81.54% is the change from 661 to 122
Calculation steps:
[( 122 - 661 ) ÷ 661] x 100 = -81.54%
Formula
Percentage change = [(122 - 661) / 661] x 100
Subtract the new number by the original number
122 - 661 = -539
-539 ÷ 661 = -0.8154311649016641
-0.8154311649016641 x 100 = -81.54%