-31.69% is the change from 972 to 664
Calculation steps:
[( 664 - 972 ) ÷ 972] x 100 = -31.69%
Formula
Percentage change = [(664 - 972) / 972] x 100
Subtract the new number by the original number
664 - 972 = -308
-308 ÷ 972 = -0.3168724279835391
-0.3168724279835391 x 100 = -31.69%