-79.73% is the change from 661 to 134
Calculation steps:
[( 134 - 661 ) ÷ 661] x 100 = -79.73%
Formula
Percentage change = [(134 - 661) / 661] x 100
Subtract the new number by the original number
134 - 661 = -527
-527 ÷ 661 = -0.7972768532526475
-0.7972768532526475 x 100 = -79.73%