-93.95% is the change from 661 to 40
Calculation steps:
[( 40 - 661 ) ÷ 661] x 100 = -93.95%
Formula
Percentage change = [(40 - 661) / 661] x 100
Subtract the new number by the original number
40 - 661 = -621
-621 ÷ 661 = -0.9394856278366112
-0.9394856278366112 x 100 = -93.95%