-92.33% is the change from 665 to 51
Calculation steps:
[( 51 - 665 ) ÷ 665] x 100 = -92.33%
Formula
Percentage change = [(51 - 665) / 665] x 100
Subtract the new number by the original number
51 - 665 = -614
-614 ÷ 665 = -0.9233082706766917
-0.9233082706766917 x 100 = -92.33%