-32.49% is the change from 945 to 638
Calculation steps:
[( 638 - 945 ) ÷ 945] x 100 = -32.49%
Formula
Percentage change = [(638 - 945) / 945] x 100
Subtract the new number by the original number
638 - 945 = -307
-307 ÷ 945 = -0.32486772486772486
-0.32486772486772486 x 100 = -32.49%