-92.31% is the change from 663 to 51
Calculation steps:
[( 51 - 663 ) ÷ 663] x 100 = -92.31%
Formula
Percentage change = [(51 - 663) / 663] x 100
Subtract the new number by the original number
51 - 663 = -612
-612 ÷ 663 = -0.9230769230769231
-0.9230769230769231 x 100 = -92.31%