-96.52% is the change from 661 to 23
Calculation steps:
[( 23 - 661 ) ÷ 661] x 100 = -96.52%
Formula
Percentage change = [(23 - 661) / 661] x 100
Subtract the new number by the original number
23 - 661 = -638
-638 ÷ 661 = -0.9652042360060514
-0.9652042360060514 x 100 = -96.52%