-91.83% is the change from 661 to 54
Calculation steps:
[( 54 - 661 ) ÷ 661] x 100 = -91.83%
Formula
Percentage change = [(54 - 661) / 661] x 100
Subtract the new number by the original number
54 - 661 = -607
-607 ÷ 661 = -0.9183055975794251
-0.9183055975794251 x 100 = -91.83%