-79.64% is the change from 663 to 135
Calculation steps:
[( 135 - 663 ) ÷ 663] x 100 = -79.64%
Formula
Percentage change = [(135 - 663) / 663] x 100
Subtract the new number by the original number
135 - 663 = -528
-528 ÷ 663 = -0.7963800904977375
-0.7963800904977375 x 100 = -79.64%