-31.79% is the change from 972 to 663
Calculation steps:
[( 663 - 972 ) ÷ 972] x 100 = -31.79%
Formula
Percentage change = [(663 - 972) / 972] x 100
Subtract the new number by the original number
663 - 972 = -309
-309 ÷ 972 = -0.31790123456790126
-0.31790123456790126 x 100 = -31.79%