-92.37% is the change from 668 to 51
Calculation steps:
[( 51 - 668 ) ÷ 668] x 100 = -92.37%
Formula
Percentage change = [(51 - 668) / 668] x 100
Subtract the new number by the original number
51 - 668 = -617
-617 ÷ 668 = -0.9236526946107785
-0.9236526946107785 x 100 = -92.37%